We are already uncomfortable.
Everyone has a favorite shower, right? We always loved the one at the end that wasn't covered in a stranger's ejaculate. Also, the one with really good water pressure. Look, it's hard to have roommates or dormmates or whomever this woman is forced to share a shower with, but threatening to show someone's boyfriend your tits is not a good idea, college ladies. Especially if you know he will probably see the sign and pretend to want to get back at you for being passive-aggressive by having even more shower sex. A better plan is to flush the toilet repeatedly while they're in there, and then enjoy the sounds of their non-passionate screams. Just a suggestion.