Men reach their sexual peak between the ages of 18 and 25. Yeah, you've all heard this one, but there's something to be said for nice guys finishing last.
Women have less energy for sex than men do.
Guys, you've really got to get over this one if you ever want to fully appreciate the depth of female sexuality. Furthermore, women can have multiple orgasms, and when they do often their third or fourth orgasm is more intense than their first. Women always take longer to build toward orgasm than men do. There's that male ego again, needing reassurance that you're not a bad lover if she doesn't come right away. Truth is, physiologically women can orgasm as quickly as men, but they require a psychological component to make it happen.