I normally don’t suggest non-free online resources because a) people tend to like free stuff better, b) they are usually half-scams anyway, and c) they contribute to a culture of commodification of sex which I don’t approve at all. Recalling my youth as a BDSM enthusiast, however, I also know rather well how painful it can be to feel an erotic urge and not being able to fulfill it for sheer lack of contact opportunities with likeminded persons.
This is why I am presenting you the latest endeavor of Mr. Buck Angel, who you might know as the most famous female-to-male transsexual in the world. Seeing that there were no dating sites specifically catering to the needs of trans men, he endorsed a sub-site of a larger dating websites network geared towards this specific and admittedly smallish niche. The name is, of course, Buck Angel Dating. Best luck to him and his subscribers.