Of course it’s up to you, but my advice is I would not do this. What happens if he continues to only want your body but not a relationship? Then you get caught in a cycle of sleeping with him & eventually feeling miserable because you realize you aren’t getting what you really want in the end. That’s not showing respect for yourself &  what you want. Your desires are important too. As I said, do what you want but I would tell him you won’t do that stuff without a relationship & continue to work on attracting a relationship with him.

Well it isn’t your actions that are going to bring your manifestation, it’s your energy. Just going by action isn’t even working with the LOA. It’s what people who don’t know about the LOA do. So remember not to try to do things to get him to be in a relationship with you. If you don’t have your energy right, you can do that all you want & it won’t work. Feeling like you would feel if you were already in a relationship with him & staying in that feeling consistently every day is what’s gonna manifest the relationship. If you don’t do that & just have sex with him & keep hoping that he will want a relationship, it won’t work. The relationship is manifested by you, not him.

Yellowrose is right. It's never about your actions. It's about what you feel to be true, about your beliefs. What do you expect to happen, if you slept with him? There are people who would believe that it would make things worse and others would believe it would make things better. Regardless of what you believe, you will always be right.