Do you remember Stifler from American Pie? Do you also remember the intense pleasure he felt when that nurse milked his prostate? This may be a bad example, granted 1) that's a movie and 2) that scene is a little, well, yeah — but the point is this: pegging your boyfriend does not mean he's gay. In fact, guys can receive such mind-blowing pleasure via the back door, it even has a name: The P-spot. (P = prostate). So what this really means he's comfortable with his sexuality, up for trying new things, and enjoys really, really good orgasms.