A guy talks to his friend:
-I thought of killing my wife... but I'm trying to find a solution for the perfect murder. I keep thinking and I do not have any idea...
His friend, a funny guy, tells him:
-Simple, have sex with her all the time, but all the time... she will get so tired that she will die. The perfect crime! No one can accuse you of anything.
They meet again 6 months later. The wife was beautiful, flourishing, and her husband was barely walking.
-How are you? asks his friend.
-Hmm, so and so, but look at her, the stupid... she has no idea she's dying!