What is a sissy? A sissy is a guy who is straight, bi, or gay. Sissies enjoy being feminized. They may have any combination of fetishes including feminization, crossdressing, pegging, cocks (even the straight guys), forced bi, forced gay, hormone therapy, cuckold, etc. For some it's a fetish, and it gives a sexual high. For others, they are actually transgender (a girl brain in a boy body). There's more to it that I didn't even mention, and of what I did mention there's so many shades of grey in between each.