First Grindr experience

I'm a 26 years old and I was at a friends one night and left relatively late but just before I left my friends I was on the Grindr app thought I download it. When I'm horny I usually have cyber sex but I thought let's see what the commotion is with the app (I'm bi closet never been with a guy) so filled in my details and stats and took a body pic put it up and immediately became very popular lol on the way home one guy showed me his ass ( I have a thing with asses any ass gets me hard women's or men) showed me his entrance too lol I was immediately arroused and my heart was racing at 100mph.He says he will only have unprotected sex tho, I was like no I'm not into that first time quite paronoid about STDs. He is driven to do it without a condom and he also says he loves stray man releasing in him. He says where are you k tell him and he says what he is wearing and he have his shorts lowered so his ass will be outside (the area was derelict)So I'm sitting at the bus stop and I see this guy walk across the road With his ass out. I can hear my heart in my ears he walks around the I can still see him when goes by he realises that I'm the only one there. My bus comes and I jump on.When I get home I have the biggest wank ever but I wondered what if I did have sex unprotected.