Ever give a blow job in a car?

So i need everyone's opinion on something. So i met a new guy. We've been talking for a couple of days now. And its going well. So today we finally met up. So i sat in the car with him and so he touched my boobs lightly here and there. We had a good conversation tho. He asked me to go down on him and i said no .just didnt want to look easy. So would it be wrong if you actually did it?? Would you feel guilty? Plus i really dont want an std.