Choose "truth."

The warmth of the Butt Sex is definitely spreading through your gut, and you're feeling the effects of the vodka like nobody's business.

You smile, and say, "Truth."

The guy in the wifebeater claps his hands, and rubs them together, pondering. After a short while, he leans forward.

He says, "What's your dirtiest fantasy, birthday boy? The nastiest thing you want to do?"

You blink, and to your surprise, your dick throbs just thinking about the question. You shift slightly in your seat, thinking about it. X-rated visions pop into your head, and you decide.