Surprise, surprise. Just as we’d always assumed, dudes like sex more than chicks. However, now there is scientific evidence to prove its true. And no, your tally marks on your bed post of how many times your lady has denied you don’t count as “scientific evidence.”

A new book has just come out by Dr. Louann Brizendine called The Male Brain, which, among other things, explains to us that the male brain’s area associated with sexual pursuit is 2.5 times larger than the females, and that the testosterone area is 10 to 15 times bigger as well. This, she explains, gives a natural reason to why men are more inclined to cheat. Oh, great.

She does note, though, that the human brain is malleable and can be taught easily to learn new things. So, men, enjoy your time following your natural sexual rabidness, but if you get in a relationship, don’t use this article as an excuse to cheat!