During mating, the male pierces the body wall of one of the female's abdominal segments with this organ and deposits his sperm in a sac. The twist, says Simmons, is that the female lock may not be physically complicated. His attempts to impress the female ducks with his plumage and courtship displays have failed. Here are a few excerpts that caught my eye: Female mammals certainly have evolved strategies to cope with other forms of male sexual control, though. So much variety, in fact, that some closely related species of insect that otherwise look identical can be distinguished purely because of differences in the shape of their sexual organs. Right at the heart of that fight you will find some extraordinarily shaped sexual organs. This gender conflict stems from the fact that males and females tend to have different goals in mind during mating season.
Weird fetish of the day: Our planet is populated by millions of animal species, and penetrative sex between male and female has been helping many of them reproduce for millions of years. These sperm are thought by some scientists to join together and form a tangled mess that ensnares the sperm of rival males - although the idea is controversial. All of this variety could be no accident, claimed Dufour, and in he came up with a theory to explain what was going on. Patricia Brennan at the University of Massachusetts Amherst thinks female ducks may have evolved such a vagina to increase their level of control during the breeding season. The female genital tract of many species is too simple to prevent males belonging to any number of species from successfully mating with her. A number of different websites also make references to Joshua Handley, an English nineteenth century artist travelled to Japan and developed an obsession with tentacle erotica and inspired a short online essay Tentacles of Desire: Info website — again be warned these are very sexually explicit. During mating, the male damselfly uses abdominal claspers to grab the female by the neck. This may help to guarantee that there is an egg waiting for the sperm at the end of their swim. Females have responded to this aggressive male sexual behaviour by developing a special defensive structure - an area on the abdomen where the hard scaly skin is replaced by soft spongy tissue that males find easier to stab. With one successful penis stab to the flank of its partner, a flatworm ends its involvement in rearing the next generation, leaving it free to swim away and mate again. The variation in shape and size of this penis bone is astonishing, if a little eye watering from the female perspective. These hooks are able to remove a previous mate's sperm contained within the female's sperm storage organs. They provide a perfect example of how the antagonistic battle of the sexes has led to some truly peculiar sexual organs - particularly because in the case of ducks, the vagina is no less bizarre than the penis. Less blatant and decidedly less pornographic are the various literary writings and artworks depicting human-octopus couplings and dating back to the eighteenth and nineteenth centuries. These penetrate the lining of the female's genital tract, leaving puncture wounds. The article does say that: Sexual conflict has probably also had a hand in shaping the strange sexual organs of the bat bug. Eberhard has looked at hundreds of insect species, and discovered something interesting: Two of the winged insects lock together in a copulatory embrace before gently spiralling downwards out of the sky to land on solid ground. Then something surprising happens. McLagan was sentenced to four months in jail wholly suspended , fined Australian dollars, and placed on the sex offenders register for four years. In many mammals - including humans - seminal fluid contains a chemical that encourages the female brain to release ovulation-inducing hormones. During mating, the male pierces the body wall of one of the female's abdominal segments with this organ and deposits his sperm in a sac. Instead they may owe their size and complexity to female demand.
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