Two men are hanging out together watching television, and one of them is getting married soon.
The married man asks, "So are you sure you want to get married? Marriage changes everything you know."
The other guy says, "Well we have sex a lot now, and we've been together for a long time. I don't see how things could possible change, just because we are getting married."
The married man says, "Believe me, before I got married, my wife was like a well trained dog who did all kinds of tricks; standing up on two feet, catching things in her mouth, you name it. The sex was great! Now, I have to beg for sex, and the only trick she knows is how to roll over, and play dead."