Hi Alex and the rest of you guy's I hope u don't mind me being here I'm a female and thought i would try to give some answer's. I can only speak for my-self but it takes me a while to reach an orgasm now oral sex is different i cumfast. I have been with guy's not alot but never had an orgasm. Men can cum alot easier then women it could be in her head has anything ever happened to her that you don't know about. Have you tried different positions,postion pillows under her thighs. another thing is when i feel like i'm getting there i tell my boyfriend not to move cause if he does it's gone and takes me a while to get it back if you cum to fast try masturbating before ya'll have sex. My sister is 36 and she has never had an orgasms clit or vaginal.The reason she has an orgasm when she masturbates is she know's her own body. well hope that helps and keep trying