. He's in his late 20's. While he does have other options, he seems to have thought out what he wants to do. Of course he can always change his mind. But there's a good chance that being in his late 20's, for now he just needs the experience.
I support whatever he wants. But really unless he were to suddenly fall in love or deep like with a guy, an experienced, kind escort who can show him things in a non-judgemental way is probably a better choice than some random pick up from a hook-up app.
Which is why if I were him, I'd do my best to make sure the escort I picked was a well-reviewed/recommended and experienced escort.
Gman