Who would have thought.
From: FOCUS MAGAZINE
Issue 229, June 2011
Section: ROUND UP
Genetics
Spiky Penis mystery solved
Researchers at Stanford University in California think they’ve identified how humans lost the spikes our ancestors had on their penises. It’s thought the loss of a particular bit of DNA that controls a hormone gene is likely to be behind the change. It was believed the spines were used to remove the sperm of competitors who had mated with a female. It’s thought that the loss would have reflected a more monogamous reproductive strategy.
sex
Posts
