It's always great to get naked, yet there is something to be said for removing your jeans or shorts and just wearing your underwear around another guy. It seems innocent enough, yet has a very heavy sexual undertone. Wear a light color so he can see your dick outline. White briefs are always a turn on. Unless he's made of stone, the visual will get him thinking, and possibly make him horny. Add some wine or beer, and voila. If you start to bone up, he'll bone up, too. Very often guys will get hard when they see other guys get hard. We can't help it. You can always blame your hormones and say you have to take care of it. He'll understand! I get horny just thinking about it!