Would You Have Sex With Someone You Met Online?

So I had never had sex before and I'm 20 is it bad? I met this guy whose 29 and I was thinking of having my first with him but I'm not sure I met him online and we exchanged #'s and we have been texting. At first we got mad at each other but the we figured everything out and he says he likes me but we haven't even met in person. I dont want to get pregnant but the good thing is that he has had a vasectomy so he can't get me pregnant is that ok/safe? I asked him if he was being serious and he was like yeah I'm not lieing why would I so.His 🍆 is big like almost 9inches so it's tempting but idk ? What would you do?