Me and my GF have had sex countless times since we started dating. She told me that she never had an orgasm even in her previous relationships … I wanted to be the first guy to make her reach orgasm. we have tried different positions, I muffed her, I rubbed her clit , i fingered her, i watched videos and i made research. Everything that i know, when i tried on her just doesn't work and i feel like a failure. I have been trying for months but she tells me that i give her a good sex . what can i do at this point, is it me??