Well, real Tgirls (with implants, hormones, face and body surgeries/enhancements) came to my attention at 42 years-OLD, about 5 years after I had the shock of a lifetime being "fooled" by a really convincing transvestite/drag queen. Of course, sheer curiosity did its job and soon I became more excited by 'trans' (AND gay) erotica than straight porn.
Even now at 53, in my 8th year as a single (divorced) man, when I manage to separate reality from fantasy, shit I'm STILL struggling with the fact that i CAN be sexually aroused by a genetic male, no matter how feminine HE appears...
Not sure if it's okay to blame my ultra-conservative, Catholic upbringing for this sort of intolerance over my own feelings but it may have taken it's toll, especially in my teenage years