Friendship Between Women:

A woman didn't come home one night. The next day she told her husband that
she had slept over at a girlfriend's house. The man called his wife's 10
best friends. None of them knew anything about it.

Friendship Between Men:

A man didn't come home one night. The next day he told his wife that he had
slept over at a buddy's house. The woman called her husband's 10 best
friends. Eight of them confirmed that he had slept over, and two claimed
that he was still there.