My SO and I have been together for a little over 2 years and for the last few months it's starting to feel like sex is a chore. It isn't as fun as it used to be and it's just kind of boring. My SO thinks it's because I don't want him to get off. He thinks that all I want is to get off and he feels like I'm using him. I've explained to him that that isn't true but he never understands what I'm saying. Our actual relationship is great, it's fun and loving but our sexual relationship isn't. At the moment I'm not putting in a lot of effort because it's boring and I've told him that but he just doesn't understand. I don't know what to do, I don't want our relationship to end because of this.