Sexy science: DNA reveals the moment human and chimp penises diverged

Scientists at Stanford University say that they have identified a stretch of DNA that explains the difference between human and chimp penises. At some point millions of years ago, man's tool lost a series of sensitive spines that still cover the sexual organs of our closest animal relatives, reports The San Francisco Chronicle.

The spines are known as vibrissae, and scientists are still unsure what role they play in the primates' sex lives. Though it's unclear why humans evolved without vibrissae, it's likely that the development helped propel mankind into the dominant position in which we find ourselves today.

While some may mourn the loss of the extra sensitivity, mankind has come up with creative ways to make sex more stimulating. There are many condoms that offer added pleasure, such as the LifeStyles® THRYLL™ condoms, which feature more than 100 raised studs.

Vibrators and special lubricants can also add extra zing when it comes time to turn down the lights and get busy. According to, there are many varieties of lubes that can help make sex easier and more pleasurable.

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