Humans having sex with a fish

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Mating, sex and the immune system in humans and fish. Sexual reproduction is still an evolutionary puzzle. To compensate for this two-fold cost of efficiency selective mate choice has to achieve at least a two-fold genetic benefit in each generation so that sexual reproduction is not lost. Sexual selection has been proposed as one mechanism to explain the maintenance of high allelic diversity in MHC genes, called HLA in humans that control the extent of resistance against pathogens and parasites in natural populations. MHC-based sexual selection is known to involve olfactory mechanisms in fish, mice and humans. During mate choice, females of the three-spined stickleback Gasterosteus aculeatus use an odour-based selection strategy to achieve an optimal level of MHC diversity in their offspring, equipping them with optimal resistance towards pathogens and parasites.
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Animals are kinkier than you

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The Talk: How to Explain Mermaid Sex to Your Kids - Willamette Week

The bluehead wrasse is a fish that lives in small social groups in coral reefs in the Caribbean. Only the male has a blue head — signalling his social dominance over a harem of yellow-striped females. If this male is removed from the group, something extraordinary happens: the largest female in the group changes sex to become male. Her behaviour changes within minutes.
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Humans Have Ancient Armored Fish to Thank for Their Sex Lives

If you've ever complained that your bedmate's behavior was similar to that of a dead fish, it might not be their fault. As it turns out, our most basic sexual behavior may have originated more than million years ago with ancient armored fishes called antiarchs. New research published in the journal Nature on Sunday posits that antiarchs — which were some of the first vertebrates with jaws — were also the first creatures to use internal fertilization to reproduce. After examining fossil data, scientists found that males had L-shaped copulatory claspers which were almost as long as their bodies and females had structures that resembled genital plates. The thinking goes like this: the claspers were inserted into the female's genital plates, which were small enough to help lock the clasper into place.
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Subscriber Account active since. Vertebrates have come a long way. Do It For Denmark! LONDON Reuters - Scientists studying fossils have discovered that the intimate act of sexual intercourse used by humans was pioneered by ancient armored fishes, called placoderms, about million years ago in Scotland. In an important discovery in the evolutionary history of sexual reproduction, the scientists found that male fossils of the Microbrachius dicki, which belong to a placoderm group, developed bony L-shaped genital limbs called claspers to transfer sperm to females.
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