Here are some of the better axioms I came across in the last year or so that capture the differences between the sexes quite sweetly.
Men like what they see, and women like what they hear.
That's why men lie, and women wear make up.
Men insult each other to get along, but they don't mean it.
Women compliment each other to get along, and they don't mean it either.
A girl dreams about a bad boy who is gentle only for her.
A boy wants a good girl who is naughty only for him.
(This one comes from a friend)
Women fake orgasms/sexual interest to get relationships.
Men fake relationships to get orgasms/sex.
Here are two of the best:
A woman's loyalty is tested when her man has nothing.
A man's loyalty is tested when he has everything.
Why is it that a woman who sleeps around a lot is a slut, but a man who has lots of sex is great?
Because a lock that can be opened by many keys is a lousy lock, while a key that can open many locks is the master key.