There are times when it is better to wear underwear than not. Here’s what the experts sayIn 2015, during a particularly energetic performance of the song American Woman in Stockholm, Lenny Kravitz split a pair of leather pants right down the crotch, revealing his manhood to the world.I’m sorry to say I think about this incident somewhat regularly. Not out of titillation, but because it planted in my head a troublesome question: just how many people, rock stars or otherwise, aren’t wearing underw