Different sex drives

Me and my partner have different sex drives. I’m always wanting it and she doesn’t really care for it. We are a lesbian couple btw. I am bisexual. My past relationships were with men and sex was never an issue. In my past we wouldn’t go more than 2 days without it. Now in my current, we go a whole month. And I know this is selfish but it’s getting to the point where I’m fantasizing about having sex with women and men all the time. I feel bad but I just need it and miss it. Idk what to do. Also, she will start something but then it just ends up with this weird energy bc I can tell she’s forcing herself to do it for me. She says she forces herself to do it because she knows sex makes me happy. What do I do???