Q. How do you persuade your str8 flatmate to let you tie him up in his underwear?
A. In this case, it took seven pints of beer, a couple of shots of tequila, and a game of Dare Poker!
Q. And how do you persuade him to let you pull his boxers down for a good look at his cock?
A. I didn’t have to persuade him - he was tied up! LOL