About hermaphrodites and sex

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You've got two life forms who are hermaphrodites, and they're having sex. But how do you describe it accurately, without calling on human-centric terms like "male" and "female" or "penis" and "vagina"? It's one of those rare writing questions that comes up for both scientists and science fiction writers.

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In Britain, female facial hair was likely to be associated with insanity, while in France it was more likely to be seen as a mark of remarkable strength. Other interesting differences emerge… Hermaphrodites and the Medical Invention of Sex is richly researched, detailed and fascinating. The book offers us all a lesson in self-awareness.

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Intersex is a group of conditions where there is a discrepancy between the external genitals and the internal genitals the testes and ovaries. The older term for this condition is hermaphroditism. Although the older terms are still included in this article for reference, they have been replaced by most experts, patients and families.

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Hermaphrodites combine the male and female sex functions into a single individual, either sequentially or simultaneously. This simple fact means that they exhibit both similarities and differences in the way in which they experience, and respond to, sexual conflict compared to separate-sexed organisms. Here, we focus on clarifying how sexual conflict concepts can be adapted to apply to all anisogamous sexual systems and review unique or especially important aspects of sexual conflict in hermaphroditic animals.

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We are broadly interested in understanding the phylogenetic distribution of hermaphroditism across the animal kingdom, unraveling the social and environmental conditions that favor hermaphroditism over alternative forms of gender expression such as separate sexesand experimentally assessing the causes and consequences of sexual selection in hermaphrodite mating strategies. Simultaneous hermaphroditism is a widespread form of gender expression among most invertebrate phyla and also occurs among fish. The scattered distribution across the animal phylogeny indicates that alternative forms of gender expression are rather flexible and may be repeatedly gained and lost across evolutionary time scales.

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Unless otherwise indicated, you may copy, reprint, distribute, and even modify contents of this web site under the Creative Commons license. Below is some of the fun facts we've come across about hermaphrodites. Please note that "hermaphrodite" in its true sense that is, able to produce both eggs and sperms does not occur in humans; the so-called "hermaphrodite" people are actually intersex people--those who have been born with reproductive organs that are different from the standard "male" and "female" for more information about intersexuality in humans, read this.

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Sexual conflicts between mating partners can strongly impact the evolutionary trajectories of species. This impact is determined by the balance between the costs and benefits of mating. However, due to sex-specific costs it is unclear how costs compare between males and females.

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Hermaphroditismthe condition of having both male and female reproductive organs. Hermaphroditic plants —most flowering plants, or angiosperms —are called monoecious, or bisexual. Hermaphroditic animals—mostly invertebrates such as wormsbryozoans moss animalstrematodes flukessnailsslugsand barnacles —are usually parasitic, slow-moving, or permanently attached to another animal or plant.

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Janet L. Over the last years, research has established that a sexual selection exists and is widespread in the plant and animal kingdoms; b it does not necessarily entail sexual dimorphism; even hermaphrodites have it; c it does not require intelligence or a sophisticated sense of esthetics; even tapeworms and plants choose mates; and d it does not require brawn or even mobility for competition; plants may compete for pollinators, and broadcast spawning invertebrates may also compete for matings. Although discussions of sexual selection often focus on sexual dimorphism, several phenomena that are commonly associated with sexual selection are widespread and highly developed in hermaphrodites.


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