7 Things Men Don't Know About Their Own Bodies
From head to toe, he's full of surprises (and learning about them could help him live healthier).
They’re Designed to Keep Other Men from Coming Between Them and Their Beloved
Talk about competitive! A 2004 study in the journal Evolutionary Psychology suggests that the unique shape of the human penis evolved not only as a way deposit sperm into a vagina but also to displace the semen of a recent rival. Researchers from SUNY Albany tested an array of artificial phallus shapes and found that the penile head, with its pronounced ridge, does a fine job of ousting sperm that had been left behind and replacing it with new contenders.
As a reminder, always consult your doctor for medical advice and treatment before starting any program.