Ummm... I don't remember. It's been 6 years since we got together, but I remember the first time we really discussed it. It was a NO for both of us, but I believe we both were on the topic. Hell, I was just shocked into bliss when I realized he wasn't going to beg and threaten me with anal sex like every single other male on the planet I've ever been with. Ugh! What a relief. No anal sex pressure here! But if I really had some interest in it, I'm sure he'd go through with it. We talk about butt sex, usually joking about it, but I doubt it's something we'll ever get into.
I actually brought it up. When we first got together when we were 16, I said that was one thing I wouldn't ever do. He said ok and never brought it up again. About a year ago (maybe a little less?) I expressed interest in it. He was excited and we tried multiple times until recently when we were finally successful. He is not really huge about it like a lot of guys are, but he thoroughly enjoys it especially now!