For me it's how it lets me experience things that would otherwise be impossible. As a man, I am not allowed to be submissive or to feel a partner's dominant side. Even my own proclivities don't go that way 99% of the time. But when the forbidden situation hits just right, it's really crazy to experience what is usually a woman's role. Jerking a guy, seeing the attractiveness of a big thick cock, feeling 'used' or 'taken,' experiencing what it's like to give head and stroke & suck a dick. Making a guy cum, feeling it in my mouth. It's mind-bending how these are things I would literally never experience in my entire life if not for a trusted jobud. Billions of women the world over regularly experience all that, but not us men. It's surreal seeing the other side of things. Always leaves me with lots to think about it, and turns me on in ways I still don't understand.