Chapter 12- Sexual Behavior in Adolescence
... cultures described. Because of long years during which husband and wife live together like brother and sister, actual sexual intercourse does not spring from a different order of feeling from the affection that one has for one’s daughter or one’s sister. It is simply a more final and complete expres ...
... cultures described. Because of long years during which husband and wife live together like brother and sister, actual sexual intercourse does not spring from a different order of feeling from the affection that one has for one’s daughter or one’s sister. It is simply a more final and complete expres ...
University of Groningen Sexual problems in elderly male and female
... a partner.9 Considering the demographic characteristics of HF patients in daily practice, in which 50% are women and 30e50% are living alone,10e12 more in-depth information is needed on the problems of both female and male patients and patients with or without a partner. At the same time it is known ...
... a partner.9 Considering the demographic characteristics of HF patients in daily practice, in which 50% are women and 30e50% are living alone,10e12 more in-depth information is needed on the problems of both female and male patients and patients with or without a partner. At the same time it is known ...
Sexting Among Young Men Who Have Sex With Men: Results From
... risk across studies may be attributable to the populations studied and their sociodemographic characteristics (e.g., gender, relationship status, sexual orientation). Given the noted differences by gender and sexual identity in these studies, we sought to extend this work by examining the prevalence ...
... risk across studies may be attributable to the populations studied and their sociodemographic characteristics (e.g., gender, relationship status, sexual orientation). Given the noted differences by gender and sexual identity in these studies, we sought to extend this work by examining the prevalence ...
Plantas com efeito na impotência
... Resumo: The aim of this study was to examine the effect of Ginkgo biloba on antidepressant-induced sexual dysfunction. The Ginkgo biloba (n=19) and the placebo groups (n=18) were divided; each to be administered with Ginkgo biloba and placebo respectively for 2 months by means of a randomized placeb ...
... Resumo: The aim of this study was to examine the effect of Ginkgo biloba on antidepressant-induced sexual dysfunction. The Ginkgo biloba (n=19) and the placebo groups (n=18) were divided; each to be administered with Ginkgo biloba and placebo respectively for 2 months by means of a randomized placeb ...
GENERAL ZOOLOGY
... theory of amoeboid movement is based on the assumption that a relatively stiff, elastic layer, the plasmagel, surrounds the cell just beneath the plasmalemma and encloses the more fluid inner contents, or plasmasol. Localized changes cause a temporary liquefaction of the gelatinous outer layer at t ...
... theory of amoeboid movement is based on the assumption that a relatively stiff, elastic layer, the plasmagel, surrounds the cell just beneath the plasmalemma and encloses the more fluid inner contents, or plasmasol. Localized changes cause a temporary liquefaction of the gelatinous outer layer at t ...
Drug assertiveness and sexual risk-taking behavior in a sample of
... examined. The distributions for number of grams of methamphetamine used and total number of sex acts were positively skewed, and log 10 transformations were performed to correct for skewness. Participants who scored 15 or more on assertiveness (1 standard deviation or more above the mean) were compa ...
... examined. The distributions for number of grams of methamphetamine used and total number of sex acts were positively skewed, and log 10 transformations were performed to correct for skewness. Participants who scored 15 or more on assertiveness (1 standard deviation or more above the mean) were compa ...
Journal of Molluscan Studies
... organism in the competition for reproductive success (Darwin, 1871). The two sexes face this competition differently, since their reproductive contributions differ. In general, females invest more resources, leading them to be the more selective sex (Trivers, 1972). On the contrary, males produce re ...
... organism in the competition for reproductive success (Darwin, 1871). The two sexes face this competition differently, since their reproductive contributions differ. In general, females invest more resources, leading them to be the more selective sex (Trivers, 1972). On the contrary, males produce re ...
Missouri State Standards (Biology I End of Course Exam) Biology
... I. There is a fundamental unity underlying the diversity of all living organisms 1. Recognize cells both increase in number and differentiate, becoming specialized in structure and function, during and after embryonic development. DOK: 1 2. Describe the structure of cell parts (e.g., cell wall, cell ...
... I. There is a fundamental unity underlying the diversity of all living organisms 1. Recognize cells both increase in number and differentiate, becoming specialized in structure and function, during and after embryonic development. DOK: 1 2. Describe the structure of cell parts (e.g., cell wall, cell ...
Reptiles and Birds
... The shell and membranes protect the embryo and prevent the egg from drying out. This type of egg, an amniotic egg, is one of the most important adaptations to life on land. An amniotic egg has four membranes—the amnion, the yolk sac, the chorion, and the allantois. ...
... The shell and membranes protect the embryo and prevent the egg from drying out. This type of egg, an amniotic egg, is one of the most important adaptations to life on land. An amniotic egg has four membranes—the amnion, the yolk sac, the chorion, and the allantois. ...
Miller on Art, Altruism and Sexual Selection 1 The Bowerbirds and
... Miller does have in mind – behavior, artifact or mechanism – it has to be the kind of thing that can actually possess the five identifying characteristics of sexual adaptations. Consider first what Miller might mean by “art”. In the production of art, on his view, something like the following occurs ...
... Miller does have in mind – behavior, artifact or mechanism – it has to be the kind of thing that can actually possess the five identifying characteristics of sexual adaptations. Consider first what Miller might mean by “art”. In the production of art, on his view, something like the following occurs ...
BONELESS BEAUTIES
... Females do not feed while tending eggs and may die shortly after the eggs hatch. The young drift among the plankton for about one month. They then settle to the reef below. Octopi utilize dens as both a brooding chambers and as refuges from predators. Dens may be naturally occurring spaces in rocks ...
... Females do not feed while tending eggs and may die shortly after the eggs hatch. The young drift among the plankton for about one month. They then settle to the reef below. Octopi utilize dens as both a brooding chambers and as refuges from predators. Dens may be naturally occurring spaces in rocks ...
Diagnosis of STD - WPRO IRIS
... with questions about family planning, fertility regulation methods and pregnancy or concerns about sexual functioning. Clients may have sexually transmitted diseases or be at risk of contracting them. In particular, human immunodeficiency virus (HIV) infection and acquired immunodeficiency syndrome ...
... with questions about family planning, fertility regulation methods and pregnancy or concerns about sexual functioning. Clients may have sexually transmitted diseases or be at risk of contracting them. In particular, human immunodeficiency virus (HIV) infection and acquired immunodeficiency syndrome ...
Motivation And Emotion
... explaining them. However, some motivation seems to be unlearned. As chapter 3 explains, human infants come into the world equipped with a sucking instinct. Recently, evolutionary psychology has rekindled interest in the biological basis of motivation. Evolutionary psychologists argue that sex, aggre ...
... explaining them. However, some motivation seems to be unlearned. As chapter 3 explains, human infants come into the world equipped with a sucking instinct. Recently, evolutionary psychology has rekindled interest in the biological basis of motivation. Evolutionary psychologists argue that sex, aggre ...
Theories of Sexual Coercion: Evolutionary, Feminist, and Biosocial
... humans have the desires, motivations, and values that they have because they lack understanding of the evolutionary (ultimate) causes or why humans are they way they are. Because of this, people’s knowledge of the immediate (proximate) causes of rape is very limited (Thornhill and Palmer, 2000). Se ...
... humans have the desires, motivations, and values that they have because they lack understanding of the evolutionary (ultimate) causes or why humans are they way they are. Because of this, people’s knowledge of the immediate (proximate) causes of rape is very limited (Thornhill and Palmer, 2000). Se ...
Evolutionary mismatch of mating preferences and male colour
... assumptions. First, correlated evolution of male traits and female preferences within a population can only occur if there is sufficient genetic variation in both traits. Second, male traits and female preferences may correspond well only in populations that have reached evolutionary equilibrium for ...
... assumptions. First, correlated evolution of male traits and female preferences within a population can only occur if there is sufficient genetic variation in both traits. Second, male traits and female preferences may correspond well only in populations that have reached evolutionary equilibrium for ...
F - UBC Zoology
... of purifying and directional selection. This paper builds on this previous work by determining the conditions under which segregation favors an increased frequency of sex when there is overdominant selection. Segregation breaks down one-locus genetic associations between alleles on homologous chromo ...
... of purifying and directional selection. This paper builds on this previous work by determining the conditions under which segregation favors an increased frequency of sex when there is overdominant selection. Segregation breaks down one-locus genetic associations between alleles on homologous chromo ...
biology - Textbooks Online
... Our planet, earth, is occupied by diverse kinds of living organisms. They live in various environments. The world is estimated to have 5 to 30 million species of living organisms. At present about 2.5 million species of living organisms have been given scientific names. Over 1.5 million of them are ...
... Our planet, earth, is occupied by diverse kinds of living organisms. They live in various environments. The world is estimated to have 5 to 30 million species of living organisms. At present about 2.5 million species of living organisms have been given scientific names. Over 1.5 million of them are ...
Clade Clitellata
... Class Oligochaeta and Class Hirudinida Form reproductive structure called a clitellum ...
... Class Oligochaeta and Class Hirudinida Form reproductive structure called a clitellum ...
Effects of Type of Coping Response, Setting, and Social Janet Sigal,
... We predicted that HBU students would view the harasser as guilty less often than would students from the multicultural university. In addition, we expected Black students overall to prefer more direct coping responses than other students. It was also hypothesized that students would see sexual haras ...
... We predicted that HBU students would view the harasser as guilty less often than would students from the multicultural university. In addition, we expected Black students overall to prefer more direct coping responses than other students. It was also hypothesized that students would see sexual haras ...
Psychological and Physiological Adaptations to Sperm
... Sperm competition has been documented or inferred to exist in many species, ranging from molluscs (Baur, 1998) and insects (Simmons, 2001) to birds (Birkhead & Møller, 1992) and mammals (Gomendio, Harcourt, & Roldán, 1998). In species with internal fertilization, there is the potential for sperm co ...
... Sperm competition has been documented or inferred to exist in many species, ranging from molluscs (Baur, 1998) and insects (Simmons, 2001) to birds (Birkhead & Møller, 1992) and mammals (Gomendio, Harcourt, & Roldán, 1998). In species with internal fertilization, there is the potential for sperm co ...
Psychological and Physiological Adaptations to Sperm Competition
... Sperm competition has been documented or inferred to exist in many species, ranging from molluscs (Baur, 1998) and insects (Simmons, 2001) to birds (Birkhead & Møller, 1992) and mammals (Gomendio, Harcourt, & Roldán, 1998). In species with internal fertilization, there is the potential for sperm co ...
... Sperm competition has been documented or inferred to exist in many species, ranging from molluscs (Baur, 1998) and insects (Simmons, 2001) to birds (Birkhead & Møller, 1992) and mammals (Gomendio, Harcourt, & Roldán, 1998). In species with internal fertilization, there is the potential for sperm co ...
HUMAN SPERM COMPETITION
... (e.g., Gallup, Burch, & Berens Mitchell, 2006). Smith outlined several contexts in which sperm from two or more men might concurrently occupy the reproductive tract of a woman. Prostitution, communal sex (e.g., wife-swapping and orgies), courtship (e.g., short-term matings), rape, and female infidel ...
... (e.g., Gallup, Burch, & Berens Mitchell, 2006). Smith outlined several contexts in which sperm from two or more men might concurrently occupy the reproductive tract of a woman. Prostitution, communal sex (e.g., wife-swapping and orgies), courtship (e.g., short-term matings), rape, and female infidel ...
File - THE ISLAM SHOW
... The functioning of a person's hormonal system generally begins when he is still in his mother's womb and continues right up until his death. Reproductive glands start to function as a result of the effect of hormones too. But unlike other parts of the body, the secretion of hormones relevant to the ...
... The functioning of a person's hormonal system generally begins when he is still in his mother's womb and continues right up until his death. Reproductive glands start to function as a result of the effect of hormones too. But unlike other parts of the body, the secretion of hormones relevant to the ...
Climate adaptation and speciation: particular focus on reproductive
... postzygotic barriers. Pied flycatchers are becoming displaced from the most preferred breeding sites leading to habitat segregation (A) and on average onset their breeding later than collared flycatchers (B). Females of both species show genetically determined preferences for males of their own spec ...
... postzygotic barriers. Pied flycatchers are becoming displaced from the most preferred breeding sites leading to habitat segregation (A) and on average onset their breeding later than collared flycatchers (B). Females of both species show genetically determined preferences for males of their own spec ...
Sexual reproduction
Sexual reproduction is a form of reproduction where two morphologically distinct types of specialized reproductive cells called gametes fuse together, involving a female's large ovum (or egg) and a male's smaller sperm. Each gamete contains half the number of chromosomes of normal cells. They are created by a specialized type of cell division, which only occurs in eukaryotic cells, known as meiosis. The two gametes fuse during fertilization to produce DNA replication and the creation of a single-celled zygote which includes genetic material from both gametes. In a process called genetic recombination, genetic material (DNA) joins up so that homologous chromosome sequences are aligned with each other, and this is followed by exchange of genetic information. Two rounds of cell division then produce four daughter cells with half the number of chromosomes from each original parent cell, and the same number of chromosomes as both parents, though self-fertilization can occur. For instance, in human reproduction each human cell contains 46 chromosomes, 23 pairs, except gamete cells, which only contain 23 chromosomes, so the child will have 23 chromosomes from each parent genetically recombined into 23 pairs. Cell division initiates the development of a new individual organism in multicellular organisms, including animals and plants, for the vast majority of whom this is the primary method of reproduction. A species is defined as a taxonomic rank. A species is often defined as the largest group of organisms where two hybrids are capable of reproducing fertile offspring, typically using sexual reproduction, although the species problem encompasses a series of difficult related questions that often come up when biologists define the word species. The evolution of sexual reproduction is a major puzzle because asexual reproduction should be able to outcompete it as every young organism created can bear its own young. This implies that an asexual population has an intrinsic capacity to grow more rapidly with each generation. This 50% cost is a fitness disadvantage of sexual reproduction. The two-fold cost of sex includes this cost and the fact that any organism can only pass on 50% of its own genes to its offspring. One definite advantage of sexual reproduction is that it prevents the accumulation of genetic mutations.Sexual selection is a mode of natural selection in which some individuals out-reproduce others of a population because they are better at securing mates for sexual reproduction. It has been described as ""a powerful evolutionary force that does not exist in asexual populations""Prokaryotes reproduce through asexual reproduction but may display processes similar to sexual reproduction (mechanisms for lateral gene transfer such as bacterial conjugation, transformation and transduction), but they do not lead to reproduction. In prokaryotes, the initial cell has additional or transformed genetic material.