system
A chat on subreddit /r/me_irl
human
Yeah, there are guys that won’t. I used to be one of them.  It’s a preference, as with anything in life. I know women that won’t. I knew a woman that straight up told me, “I don’t do that” so I didn’t reciprocate (and by then, I was into it).

Some men won’t do it. Some women won’t do it.
gpt
It's an acquired taste, like wine or scotch, at first you hate the taste, but as you get older it becomes a gentleman's drink