If she is underage, you never ask her for sex. If she is an adult, you can discuss having sex, but honor her views, particularly if you have not known her long enough to form a relationship. You would definitely provide her with recent written proof that you have no venerial diseases and be prepared with contraception.
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I see two to answer, A you exchange Favours then don't ask, tell! B if you know what your doing in the bedroom she should be on it before you Evan worry bout the question.
First prepare your self and then open your mouth and start sucking like its a Popsicle but if you want a guy to feel really GOOD, get your tongue Pierced IGHT See ya :)... GOOD LUCK!! :D