When you're moving from foreplay to the penetration portion of sex, a little bit of friction is a welcome addition. But too much of it can easily turn 'ooh' into 'ouch,' leaving that area dry and ...

When it comes to fundamental physics, friction is great for things like stopping at red lights or avoiding slipping down the stairs, but not so great for your sex life. The good news is that you don't ...

Fun fact: K-Y Jelly, one of the most popular lubricant brands on the market, was created in 1904 and used not for sex, but as a surgical aid. When people did catch on that this jelly could be used in ...