Christianity and BDSM

I grew up Southern Baptist in the late 60's which means that I heard about sex more by the lack of coherent comment than by explicit warnings to avoid it. By the time I came of age the sexual revolution was in full-swing -- post Stonewall and the original Women's Lib marches, long after the pill, adecade before AIDS terrorized us into being "good" and "celibate" like Mr. Falwell.
Sex was "bad" in general (except inside of marriage) but they never really specifically said which type -- man on top, anal, oral, fetishy. I assumed that that meant that what happened between the duly married was their business, and, having read the Bible through more than once (okay, maybe I skiped Job the second time and some minor prophets) I found nowhere (except in reference to a woman's "unclean time" in Leviticus -- the same book that talks about eating of clean and unclean animals and forbids spilling your seed on the ground and male to male intercourse) when specific sex acts were excluded. Therefore, except for the fact that I am currently unwed, I don't think that God cares if the woman is on top in a corset and nipple clamps with a reddened ass or if the man's scrotum is pierced multiply. And if they make each other feel good in their souls' houses then they are a little closer to heaven.