The problem is that even in a heterosexual relationship, you need to mix it up sometimes. Otherwise it gets boring.
Frankly, what amazed me was all these middle aged white women who got all excited about the Fifty Shades of Gray movies. Rich guy treats his partner in a controlling and abusive way, and women just swooned over this movie.
The survey shows that 50% have tried it at least once. (and 36% of women admitted being on the other end of it). I have no problem with those numbers, they sound about right. People try things to see how they feel, and the rise of pornography has no doubt popularized it.
Doesn't appeal to me personally, but a lot of things don't appeal to me.