Otherwise, the vagina is highly acidic and sperm will die within hours." With that in mind, "semen displacement would therefore only be an issue if a female is having sex with multiple men within a period of hours or during ovulation," she says. She explains that there are loopholes, especially when you look at how the body ovulates: "Sperm can live up to five days protected by cervical mucus. Though this may be hard to believe, and honestly, it just sounds like misogynistic BS, sex researcher Sarah Melancon, PhD, says it's a real evolutionary theory. Ackerman says this study validated the displacement theory since it proved a man's coronal ridge (aka the head of the penis that shapes into the mushroom) would drag out other men's semen and allow their own to remain when they're finished. She adds that 90 percent of the cornstarch and water mixture (the makeshift semen) was removed with just one thrust.ĭr. They were able to prove that "the shape of the penis allowed it to scoop out a semen-like substance," says Dr. The researchers used a silicone vagina and a latex penis to mimic intercourse. New Jersey-based urologist Anika Ackerman, MD, says that the semen displacement theory is a result of "evolution and male competition" and was studied by researchers in 2003. It's all based on the idea that men ultimately want to be the one to impregnate their partner and that being able to scoop out other men's semen during sex with their in-and-out thrusts increases that likelihood. This hypothesis suggests the mushroom shape can scoop out other men's semen from the vagina. Why Is the Tip of the Penis Mushroom Shaped?Īccording to evolutionary theories, some penises are shaped with their signature mushroom-like head because of what's called the semen displacement hypothesis.
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