Sex File: I can't make my new girlfriend orgasm

"Orgasm is an involuntary response, so you can't "give" your partner one. However, there are things you can do to maximise her chances of climaxing."
Trauma can impede a woman's ability to have an orgasm but so can being in a new relationship. When you have had sex in the same way for years on end, getting used to someone new can take a bit of time.