I have a huge cuck fetish and am pretty solid at RP, been in 3dx for nearly 3 years now. Ive always found that its just an issue of versatility, most women would either dom a guy, or be a sub for a guy. Grabbing a cuck means they are effectively doing both domming the cuck and subbing for the bbc or whoever they are playing with at the time. In my experience its a case of a women either wants a long term relationship with a man, or she wants to go out with multiple partners. I think in my time ive found about 3 women total who would like both.