I'm not sure the subject is really taboo -- just unpopular. For the vast majority of people, sex is not experienced as purely a physical function. Young teenage boys may be an exception, LOL. But I think it's really pretty rare for people not to get emotionally invested in their sexual partners. Obviously that's why we expect sex to occur in marriage or a relationship, and when you place yourself outside those institutions, people feel uneasy because they don't know how to categorize you.

Also, I think most women (most people, but especially women) really would pick a loving relationship over pure sex if they were forced to choose. So when you make it clear that that's not what you're offering a woman, your chances of response go down.

Just my opinion.