Sophie’s Reviews > Nature's Nether Regions: What the Sex Lives of Bugs, Birds, and Beasts Tell Us About Evolution, Biodiversity, and Ourselves > Status Update

The researchers found that the proportion of sperm the woman expelled was determined by her orgasm. if she did not climax, or if her climax was more than a minute before the men’s ejaculation, she retained little of his sperm. If however, she had an orgasm during or after the men’s ejaculation, she retained a lot - women can use their organisms to manipulate the likelihood of a man fertilising an egg of hers.