You can also get "baggies" that are baggy shorts over tight shorts with a chamois.

But jeez -- are you sure you aren't overreacting just a wee bit? You can't see anyone's crotch unless they're off the bike, anyway. I doubt people are staring at your man's crotch -- more likely, they're too busy being self-conscious about the clothes they're in, or maybe even too busy riding their bikes!