First, there is body odor, which requires frequent medication. Shaving is more convenient and smells better.
The other is that you need to attend public places often, and you need to wear underarms, so you will shave them off to show politeness. This is the same as female stars, especially some gyms that coach girls. You need to pay more attention to your appearance.
Another question is whether it is really gay. He likes to give people a clean and fresh feeling, so he will shave off all his leg hair, pubic hair and armpit hair, so that when he takes off his clothes, he will really feel like a beautiful teenager if he looks small. Will attract some old men who like young people.