Online dating sites i've been on have guys, that are in a sense pigs. They can bluff pretty good too.
I've stumbled upon a few Transgender dating sites. I avoid the ones with 'dirty' pictures. But, i generally always see guys that are obvious pigs, and certain guys that bluff well. Sometimes there's obvious signs, like semi nude pictures, over 20 or so other 'friends', or as you've said, 'wanting to be discrete'.
My advice is just to take things slow, no need to rush, and don't easily fool for someone so quickly. A lot of people seem to.