News tagged with vaginal orgasm

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Researchers reveal secrets of duck sex: It's all screwed up

Biology / Plants & Animals

Dec 23, 2009 | 3.9 / 5 (11) | 0

Female ducks have evolved an intriguing way to avoid becoming impregnated by undesirable but aggressive males endowed with large corkscrew-shaped penises: vaginas with clockwise spirals that thwart oppositely ...