Telling him I’m trying to Abstain from sex???

So I’ve been seeing this guy for not even a week but I like him and I can’t help but be intimate and affectionate but I really have to pull back the reigns on some things it’s just gotten a little too intense to quick and I’m really trying to stay away from sexual all together but I can get carried away with him. How do I tell him that I don’t plan on having sex it’s especially difficult because we’ve gotten pretty heated already, but I want to dial it back. HELPPPPP