Friendship among women:
A woman didn't come home one night. The next morning she told her husband that she had slept over at a friend's house. The man called his wife's 10 best friend's. None of them knew anything about it.
Friendship among men:
A man didn't come home one night. The next morning he told his wife that he had slept over at a friend's house. The woman called her husband's 10 best friend's house. 8 confirmed that he slept over, and 2 said he was still there !!!