I'm a woman and my boyfriend says I can't understand male arousal. He says that men can look at a good looking woman and get sexually aroused, the same thing that made him choose me..lol.
But I must admit as a woman, although I'm definitely attracted to men, I've never experienced that. That is to get sexually aroused by strangers. Talking to other women online and in real life, that seems to be the case.
Maybe it's evolutionary, men having more testosterone means they are more aroused. Along with the fact that they bare little of the reproductive burden (less chance of STD's, violence, pregnancy), probably means that men are much more eager to get aroused by and pursue strangers for sex than women.