I don't come here enough to know why everyone dislikes Nasman, but this actually isn't a bad idea.
I'm still in college, and this type of stuff works. After college I imagine it will be a bit more difficult to entice a pair of girls into a game of truth or dare, but what do I know.
It's not just truth or dare, but any game with sex type rules. My friend and I played strip beer pong with two girls in my friends garage. We cheated but they didn't even realize it, we had them making out with each other in their panties and they were in our beds by the end of the night. Strip poker has yeilded several people I know lays, one guy even got laid by doing this to two sets of girls twice in the same week.
The hard part isn't in the game, it's in getting the women there and willing to do it. Thats the part that actually needs a bit of skill or luck, once you've actually got some women willing to do this type of game alone with you, it's basically the perfect way to lower the slut sheild and get them to have sex with you, because they aren't being sluts, just playing a game, right?