Need some advice please

Hello everyone ☀️

My boyfriend and I are into rough sex.

Last night and this morning during sex he did something he normally doesn’t do which is slap me across the face, I was sook at first but I did it again and I loved the adrenaline it gave me😏

Plus he choked me tighter then usual but it was great... please don’t get me wrong I enjoyed everything he did even face fucking but I’d like to know when and how should i approach him about us have a safe word?

I don’t want to think the reason why I want us to have one is that I think that he’s going to me hurt me or lose control but I think we should have one but I just don’t know how to explain why?

I really love him🥰

Please help a girl out🙏