This guy & sex

So I met this guy and we are both recently single,. we knew each other when both of us were taken but friends. He helped me through my break up and I’m helping him. Since he has been single we have going on minor dates, I met one of his kids after the spilt and he wants me to meet rest of the kids one day.

We recently had sex and it was addicting, after we cuddled. But him and I are fire, we both came at the same time and was so good that writhing this I want it again.

However my one friend thinks we should stop having sex and wait till we are official BUT we have the motion of heading towards relationship down the line just not now.

My question is:When you met your significant other when did you have sex? and if early did the relationship last?