Just now starting to enjoy sex

Alright so, my husband and I have been together for 4 years-dated for two years  married 2 years. We have sex just about everyday. For the most part-I didn't enjoy sex all that much. He's the only one I've ever had sex with as well. I never orgasimn when having sex but I always make sure he does. I do once every few months. I've always felt like its something I had to do-not wanted to really do. Idk if it because I could never focus on it or because I very rarely orgasimn. But for the past two days, I've been so frisky. We've had sex 3 times in the past 24 hours for a least an hour and I LOVE it. I've never enjoyed sex so much. I guess what I'm wondering now is, why now? Has this happened to any of you ladies? Don't get me wrong-I'm glad I've been like this for the past two days. I just don't know why I just started enjoying sex.