I think the key is communication. If your relationship is healthy, she should understand, especially since it sounds like you are willing and wanting MOST of the time. That's what makes this different than a sexless relationship. Now if she cares about you she should understand that you have a little bit less of a sex drive. It doesn't sound like you two are lacking in sex, so it shouldn't feel like rejection. She just needs to understand that there are other things to do than constantly fuck. Someone who cares about you will understand. Like I said, it's not like you're sexless and don't ever require physical intimacy.

I'm male, but I'm kind of in the same position with my GF. She has a higher sex drive than me. Which I've never experienced before. She wants it all day every day if I can give it to her. She'd be mostly content if we never left the bedroom. When I watch a movie or TV show with her I have to be careful not to get too touchy. We usually sit with her head on my lap or her resting on my shoulder or side. And if for some reason I want to playfully squeeze her ass or boobs, it almost always gets her in the mood. She's looking at me with sexy eyes trying to get me to do more or clawing at my crotch. And I'm just meaning to be playful and would really like to finish this show or movie. I give her a kiss and continue to watch what we're watching. In a few seconds she realizes this and continues to watch with me. Try some things like that. You know, give her a slap on the ass, passionately kiss her, and then keep going about what you guys were doing. She'll know sexy time is coming later, but it doesn't always have to be right there right now. It will also give you a more dominant feel. Grab her sternly or playfully, but like I said, keep going about what you were doing. It tells her that you find her sexy and want her, but that you don't need to drop everything to fuck at that very second.