Strange guy… if he wants to lay low then why not just lurk and never post?
Your friend seems to have some very contradictory impulses: He’s really comfortable visiting the spa all the time but really worried about online forums.
He’s afraid to open an account and yet he still wants to email you so you can post for him?
How is it any more anonymous if he’s posting through your anonymous account rather than his own?
If he doesn’t want the girls at the spa to figure out who he is, you would think the absolute last thing he would ask you to do is accuse the girls online of giving him an sti and then describe exactly who he has stayed with and what services he received over a given period of time. I don't think it would terribly difficult for them to figure out who he is given that information.
Quite the unusual fellow!