You don't tell...

Hey, who would have guessed, men indeed ARE hornyer than women. What can we do? It’s in our blood.

“Some scientists believe that these differences have a biological basis. Evolutionary psychologists argue that ancestral men, to spread their genes, had much to gain from having sex with as many women as possible. In contrast, given the biological limitations on the number of children women could have and raise, they would benefit from being selective -- choosing mates with the best genes. Thus, men evolved a sexual psychology that makes sex with new women exciting both to imagine and to engage in, and this made men especially responsive to visual signals of sex.” 

(From Frontline, http://www.pbs.org/wgbh/pages/frontline/shows/porn/special/why.html)