Sometimes just the lack of plot is enough to turn women off. I've seen movies where there is no dialogue at all, just undulating body parts! I think men are much more turned on by the mechanics of sex then women. Most women like a story to warm them up first. For a decent selection of porn rentals that both men and women can enjoy together, I recommend Toys in Babeland on Rivington St. in NYC (
www.babeland.com)