Sometimes, I'd like it too!
Some women have to be dominant at work and at home (running around after you and doing everything house related e.g. paying bills on time, cooking, cleaning etc) and then to be controlling sex is a bit of a turn off!In bed, often women like to be more vulnerable as pleasing a woman is rather complex and she needs to let go and be 'stripped bare'.
I can only let you into why I like it, that's because by my partner 'forcing himself' upon me is like he finds me really sexy and he can't control himself. She still has the ultimate control because when she says "stop", she means it. It's quite primal really, I just like feeling like i am exclusively his to keep.