Multiple assaults causing tension in current relationship

Okay, I've had multiple times of being violated be it rape or being touched when I clearly didn't want to be... I feel like I'm strong about healing from it, but sex is like... It causes a mental block almost..? And it's like if I don't think about it I'll never do it, and I think about it sometimes... But I know it's causing tension in my relationship. I don't know how to get passed this..