I was once on a date with a person who made the argument that beauty is morally virtuous (nothing became of that for a variety of reasons, but that line stuck with me). Humans generally like seeing pretty things in the world and so to take care of one's appearance is a nice thing to do in the same way that public art is. What they're saying is that they would exploit that radiance to more selfish aims, and if you don't desire those, then nothing is lost. In fact they should be thanking you since, if one stoops to that loser sexual-marketplace-level of analysis, you're improving their odds by not participating. Doing a public service across two separate axes. I'd hardly call that a waste