wow, wrong site for this question i guess
to all the guys giving useful advises: thanks, i will take them into consideration
to the haters/moralists/ad hominem butthurts: sorry but i don't care about that. i have or lack my own morals, and your attempt to shame me into the good little moral citizen failed. no hate, really, i understand why you are all patronizing with your morality, but i'm not buying it. we are different people, what i am doing is not illegal, so thank you for your concern about my self esteem or my upbringing, but i feel they are just fine.
the only "morality" issue for me is, to not make the girl feel like a ho for doing it, because she seems like a genuinely kind hearted woman.
UPDATE for those interested: i invited her to play pool last night, i did some heavy kino there, she didn't object so when we finished, we got out of the bar, and when she wanted to enter my car, i told her "not the front seat, let's sit in the back a little" she did it, and i boned her in the car.
after that she started crying and told me she feels guilty, and now i will think she is easy and unfaithful, so i said "i'm here for you, don't worry", so she hugged me and told me "i feel so safe with you", and then we just sat there for a while, then i drove her home.
when we arrived she said she is free this weekend and asked me if i wanted to teach her shoot with the bow. so we will meet saturday. i think it went well. i will try to keep it on a friend level with the occasional seks. so far so good.