A very weak paper in PNAS has attracted some attention lately: An experimental test of the ovulatory homolog model of female orgasm

The paper aims to be a test of the hypothesis that the human female orgasm is a kind of evolutionary relic from an earlier stage in evolution.

In humans, ovulation happens on a monthly cycle and is not related to sexual activity. However, in some mammal species, such as rabbits, ovulation is triggered by sex (or copulation, as biologists say). In the new