Friends of women:

A wife was not at home for a whole night.

So she tells her husband, the very next morning, that she had to stay at her girlfriend's apartment overnight.

So the husband calls 10 of her best girlfriends and none of them confirmed that

Friends of men:

A husband was not at home for a whole night. So he tells his wife the next morning, that he had to stay at his friend's apartment overnight.

So the wife calls 10 of his best friends.

5 of them confirmed that he stayed at their apartments that night.

The other 5 claimed that he is still with them!