How do ducks have sex with their corkscrew-shaped penises?
Humans do. Here again, the coevolutionary dynamics of duck sex may clarify how men came to regain social control over female sexuality. A breeding male mallard in your typical city park has a five-inch penis. Unlike 97 per cent of birds, ducks have penises — super-long ones.
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The world of snake sex explained. Sign in. These forced penetrations have meant female ducks have evolved in such a way that their vagina can trick the male into depositing his sperm in a dead-end and thus they avoid unwanted pregnancy. Female ducks have long twisted vaginas that have a number of spirals, however, the female duck vagina also has some dead-end pockets that they can engage if they do not want to be fertilised by the male duck that is mounting them. Enter natural selection.
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