I've been with my boyfriend for just over 4 years. Our sex life has always been the strong thread in our relationship, even when we've had trouble in other areas. We both feel we are the best sexual matches we've ever had. But over the past 8 months things have slowly degraded on my end. He is still as excited as ever, but I just don't feel like it. When we try, I actually feel physically protective, as if blocking my body from a stranger, especially my breasts. It's like a physical compulsion to protect, but neither of us have a history of abuse in our relationship or outside of it, and his approach is loving and open. When he's clothed and we're not about to have sex I love holding him, being held by him, standing next to him, touching him, etc. I'm not physically repulsed by his body: I recognize that he's a ridiculously attractive man! I had some advice that I shouldn't force myself to have sex if I don't want to, but I've also heard the opposite: that I should stop thinking and just push through my body's shutdown. Most of the times when I do force myself I end up enjoying it, but that doesn't take away this "repulsion" feeling at the start. The worst thing is that he feels rejected and dissatisfied and keeps asking what he can do to turn me on. What to do?