Anyone else have trouble explaining this to their SO?

When I first started hanging out with my current boyfriend, I told him I was a lesbian. At the time, I'd never heard the word pansexual, and didn't have a clue what it meant. I had been dating his roommate before that, so he didn't exactly believe me about being gay... I wound up explaining to him that, at the time, I considered myself bi because I think both men and women physically atractive ( but not sexually) but I would rather look at a women. Now, the part I have trouble explaining to him is that I'm not sexually attracted to anyone (in general). I didn't ever plan on having sex actually, the idea didn't hold any interest for me. So even though I think women look better than men, I would rather avoid seeing naked women. He can't grasp this concept. It gets even harder for him to understand when I try to explain that I don't find him physically attractive, or didn't. After falling in love with him, I don't have eyes for anyone else. I now think he's the most beautiful person I have ever seen, and I am sexually attracted to him. Only him. He still seems to have this idea that I'm a lesbian, and since we both like red-heads he makes a lot of jokes about finding a cute red-head for us...which bothers me quie a b