Women:
A wife was not at home for a whole night. So, the next morning, she tells her husband that she stayed at her girlfriend's apartment overnight.
The husband calls 10 of her best girlfriends and none of them confirm that.

Men:
A husband was not at home for a whole night. So he tells his wife the next morning, that he stayed 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, and the other 5 are claiming that he still is there with them!

Conclusion : Men are better friends