when I was younger I used to pretend to be a girl online for a while. I used fake photos and profiles to be more credible. after a while it became kind of addicting because I was experiencing what normal men don't ever get to know: receiving spontaneous attentions and compliments without the need of doing anything. it was also kind of saddening to see how many guys stoop so low to get into a girl's pants.
I suspect it may be addicting to many women as well even if they generally don't reciprocate and are uninterested to most avances they get in their everyday routine.