Meh. I have all that with my significant other, and I get added benefits. I've always had friends that were female. Just never cared to hang out with them outside of a group setting, unless I was aiming for more than a friend.
Yung-T, If one of your female friends really really wanted to do it - like, she knew you were coming over and answered the door in just lingerie and grabbed you and started making out with you - would you hit it? If so, then that's not just a friend. If not, then I'm guessing you're dating someone else or at least sleeping with someone else you find more attractive.
