Like so many others in this thread, I can only echo the sentiment that, if the feelings are there, then how long you wait to have sex is kinda irrelevant.
I met my husband in a bar and about 8-10 hours later (after much talking and breakfast in a 24-hour restaurant), we were making the beast with two backs. That was nearly 9 years ago, and we will have been married for 3 years come September! 
Pretty much everyone seems to agree that it doesn’t really matter when you sleep together in regards to long term relationship status. Good to know. As we have date #4 coming up this Thursday I am reasonably sure he is sticking around for a bit.
Now, onto more serious questions…how soon can you refer to him as your boyfriend without making his brain melt in a fit of panic? 
Ohh - much longer for for sex. Wait until you agree on “exclusiveness” and then wait a bit longer than that…
Congrats on your relationship - that sunshine & lollipops phase can be a lot of fun.
I am glad you have found some one that makes you happy and I hope he’s the one and continues to make you happy for a long long time.
For the record, the first 3 hours were at a concert, the next almost 5 were at Denny’s, then there were several hours of driving (his place was in a different state, my place had a religious mother . . .) and y’know. sheepish grin