Gross, why would you want to have sex with someone to whom you are not attracted? This is the very definition of LD.
Your attitude toward sex, once you do find someone to whom you are attracted... is enviable. Your 'yeah, sure, why not?' attitude, I'm sure, is part of that lovely 7 adventurous side of you. When I keep my PMA in the 7ish mindset, I can often operate in this manner as well.
But if I can't... well... I can get myself there if I gotta. Although, just because a woman CAN do this, doesn't necessarily mean she should ALWAYS do this. Sometimes sex drive falls off for very good reasons, and one should not ignore their instincts.