Sexuality, and the acceptance of thinning/balding/bald/shaved men

[BaldBearded]

It's been my (observational) experience that gay men put an even greater emphasis on youth and physical attraction than straight people do"

Some... Not all!

There's also the simple fact that some look better with a shaved head .. although I don't think there's ever an example of an overweight bald guy who doesn't look substantially better, once he's gotten in shape, than he did previously. It's remarkable how differently people respond to better-defined facial features, a strong jawline (assuming one has this going for him) and well-fitting clothes.

You are stating opinion, not fact. Some members of the gay community embrace those who don't have gym bodies and are slaves to fashion.