Yep. I'm a switch, myself. Some people make me feel like running and fetching things for them, and some people make me feel like smacking them on the ass. I'm not always sure what it is about a person that makes me feel that way. It doesn't necessarily mean that I like that person more than I like someone who only attracts me in a vanilla way, but I have decided after a lot of soul-searching that I'm only going to do BDSM with people who really attract me either as a sub or a dom. Life is too short to fake interest in something that isn't working for me.

I would emphatically second Oz's advice to think about polyamory. Especially since you're bi, poly is a great way to explore different areas of sexual interest while still sharing a special bond with your partner. Since he hasn't had a chance to explore a lot of his sexuality, it might be good for him to explore, too.

If you have any questions about what that could mean for your relationship, feel free to ask me about anything. It's all about being informed and making the choice that's right for you.