I don't think I've ever "lived to fuck" since I was 20 or so. I don't think I did then. It's nice, I enjoy it, and I'm good at it, but it's never been anywhere near the focus of my life.
Your comparison doesn't work like, say, the old saw about "eating to live, or living to eat".
But- forced to choose from your two options I guess I fuck to live. I'd rather be giving out the fuckings in my life than receiving them.