Friendship among women:
A woman doesn't come home at night. The next day she tells her husband she
s lept over at a friends house.
The man calls his wife's 10 best friends. None of them know about it.

Friendship among men:
A man doesn't come home at night. The next day he tells his wife he
slapt over at a friends house.
The woman calls her husbands 10 best friends. 8 of them say he did sleep over
and 2 claim he's still there.