Now this isn't a good answer necessarily.

But I was talking to this girl last night, and she's like "I really think we should just be friends." And I replied

"I understand what you're saying but sex is just really important to me. It's something I value very highly. This might seem unusual but I actually value sex more than I value plutonic friendship. I realize this isn't the societally accepted norm but I am who I am."

I didn't end up fooling around with the girl, but I did laugh about it after.