First, call yourself whatever you want to.
Who are we to tell you what to call yourself?
That being said, if your 'nice guy' is old fashioned, you might want to be careful which words you pick if or when you choose to tell him. I'm not afraid to call myself a slut as a teenager for pretty much what you're describing (being as 'into' physical contact as I was into every other one of my hobbies - I never could do a thing halfway... ), but when I said those words to my husband, a very nice guy who sounds like your significant other, after a few minutes I clued into the fact that he was freaking out bigtime at that information. For one thing, slut meant something different to me than it did to him. To me it was someone who was shameless about enjoying physical contact, not ladylike and didn't want to be (ladies don't have that much fun
), while to him he automatically assumed I had slept with all said boys, which I hadn't. Not even with one of them. So make sure you're on the same page language-wise, otherwise you could cause a panic attack, or worse, ruin a good relationship.
But the decision to tell is yours, and depends on the two of you alone. Are you a person who wants to tell, or would hate keeping a secret? Then don't feel that you necessarily have to. My husband is AS as well, and didn't even hold my hand on the first few dates. I thought for sure he didn't even like me. Once I figured out that he did, I sent him an email that said how I felt, that I understood his feelings, that as long as he really did want me around and wasn't trying to send me a signal to go away, that was okay and that I wanted to go at whatever pace he was comfortable with, so our relationship would be whatever he wanted it to be whenever he wanted it to be that. He kissed me (and more) the next time he saw me, though he admits that if I hadn't sent that letter, he probably never would have found the courage to. So depending on your guy, telling him how you feel, that you enjoy contact, might spur him. Sometimes nice, old-fashioned guys think we're so pure that they assume we wouldn't Want to be in a physical relationship and they don't ask.
The other issue is who he is. Would the entire topic freak him out? Some guys are shy, and some are prudes. If he's the later, if the whole judeochristian concept is a big deal to him, even if it isn't to you, you might want to let him be blissfully ignorant. Do you think it is something he would want to know?
Personally, I'm a fan of well-worded honesty, but no one can tell you what's best for you. That's just what was best for me in your place. But I can't keep a secret. Might as well tell now as forget I hadn't told and accidentally mention it later.
Good luck!