Female fish in the Bahamas have developed ways of showing males that 'No means no.' The study shows that females have evolved differently shaped genitalia to deter unwanted advances from males of different populations. This "lock and key" theory suggests that females can better choose advances from wanted males by shaping their genitalia to promote copulation with desired males of their own population or species.
from Strange & Offbeat News -- ScienceDaily http://ift.tt/1TVKfDl
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