The function of copulation calls in female primates has been debated for years.
BBC: Monogamy shunned by female chimps
Our findings highlight the fact that these females use their copulation calls in highly tactical ways to minimise the risks associated with such competition.
Today, turtles often begin the sex act in open waters, sinking during copulation.
MSN: Fossilized turtles' sex act frozen in time - Technology & science - Science - LiveScience | NBC News
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