The Upsuck Theory, which dates back to the early 1900s

hypothesizes that when a woman orgasms, the contractions of her uterus help to usher the ejaculated sperm into the reproductive tract like a safety cop monitoring incoming traffic during rush hour. Consider it a vaginal vacuum of sorts, one that makes an egg-sperm meet-cute way more likely. As aptly named as this theory is, it’s also a controversial one. There isn’t a whole lot of research backing up the link between orgasm and fertility.

Some have theorized that the vaginal contractions of orgasm ‘suck’ semen up into the uterus, but others call it bunk science.

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