I never said to omit FtM status, merely that he's a guy.
Of course I'd recommend disclosing trans status, as otherwise it'd just lead to problems.
But yeah, like I say, if you're a little kinky - or even if you're not really - FetLife could be a good option and has many gender labels! [Male, Female, CD/TV, MtF, FtM, TG, GF, GQ, IS, Butch, Femme, and N/A.]