Sex after rape

I was raped when I was 5 years old when I was little and I was also raped in high school it was by my ex boyfriend who I was dating at the time I have a really hard time having sex. I have been going to talk to a counselor for almost about 2 years now. It has helped me alot. But I still have a hard time having sex. Any advice anyone has for me to help me I am open to. I am just so tired of having ptsd. As well as flashbacks. Usually if I do or when I do have flashbacks. Alot of the time I will start to cry. My boyfriend and I will stop. He is always understanding and will kiss me and hold me. He tells me that he loves me and that he would never hurt me. I need advice or how to have sex and not have flashbacks.