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As a result, we studied duck sex intensively for six, seven years. Prum: Oh, there were many surprises. Not the least that we had all these descriptions of duck genitalia, and when we looked ourselves, we said: There is almost nothing to see. How could Skinny Teen Photos My Teen Porn Pics be. That is how we discovered that the genitalia of ducks regress and regrow each year, so that a 10- or 15-centimeter penis in the summer will reduce to less than 1 centimeter in the winter and then grow back Photks next year.

Prum: Yes, it is. The pairs stay together until the clutch is laid and the females incubate. The conflict part comes next. Because now some of the males pursue an alternative mating strategy, which is to violently enforce copulation. For this they make use of their penis, which is regrown by now. This penis is a Puotos bizarre structure. It is counterclockwise coiled, and erection takes place in less than half a second. Erection, penetration and ejaculation in ducks is one and the same event, and it happens very, very rapidly.

Prum: It's very interesting. Of course, in the Skinny Teen Photos My Teen Porn Pics run, females struggle to escape from forced copulations. But in the long run, female ducks coevolve vaginal morphologies for the purpose of preventing forced intromission (or insertion of the penis) -- sort of dead end cul-de-sacs and a series of clockwise spirals that have a chiral (or non-superimposable) mismatch with the shape BDSM - Wikimedia Commons the penis.

These are literally anti-screw devices.

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Comments:

05.11.2016 РІ 05:20 Shataur:

Tentacle Porn.



12.11.2016 РІ 08:35 Faejas:

But, once in a while, most women do experience pain during intercourse. When they do, they should identify and treat the problem before having intercourse again.

There are primary and secondary causes of vaginal pain during intercourse.