I love playing with men's asses. I'm not so fond of strapons, though.
I prefer fisting, playing with dildos, beads, plugs. But if he wants to be fucked, I'll do the strapon.
I've got into it with men I find just for sex, because none of my longterm partners liked it.
How I do to get anal playing going? I ask the guy, or I simply start slowly, like playing with my finger around his ass, then, if he's receptive, getting more and more... invasive.
Since these men are just sex encounters (mostly just for one, or two nights), we use barriers to avoid STDs as much as we can.
Edit: about the power thing, I don't feel power over the man. I feel free within myself. I'm just being free and doing things I like and he likes. Having a good time.
