I think having sex with ladyboys is an interim step, perhaps you’re not ready to accept you’re gay.
When the clothes and makeup is off, it’s undeniably a guy in every sense, probably a handsome (not pretty) guy. Do you continue or stop? Do you continue and tell yourself you’re not gay? Of course you’re gay.
When I first came to Thailand 20 years ago, I was told Thailand is where the gay guys penetrate the boys and the ladyboys penetrate the straight(ish) guys.
Btw, I’m not gay but my boyfriend is, and as they saying goes, one up the bum, no harm done.