I'm a pretty built dude and my coworkers bring it up constantly. Like my appearance is a regular topic of conversation. It's not unflattering or rude but if it were a woman they were talking about everyone would think it was super weird to have, for example, the CEO commenting on some woman's appearance all the time, even to say something positive.

HR response isn’t the only thing though. A number of years ago, my (F) partner (M) was sexually harassed by his female boss. He didn’t report it to HR, but he did sometimes bring it up around his friends. He had multiple people who base a lot of their identity on their feminism/acceptance/equality views tell him it wasn’t possible for him to be a victim of sexual harassment.

And then if he brought it up around more normie people, especially guys, the most frequent first question was, “Is she hot?”

The responses he got from so many people were part of why he never took it to HR. The other part was that she was smart enough to never do it in writing, so it would have been he-said-she-said. It was just easier to get a new job.

Agreed. Unless you live outside the first world, HR will intervene because they don't want you to sue the company, regardless of your gender.