Why can i orgasm with no problem when i mastutbate but then when with my fianc i can't?

See details: She may need guidance from you about what she needs to do to help you achieve an orgasm. A frank talk may about what gives you the most pleasure would help. For some men it is not uncommon that masturbation produces the most intense satisfaction.

?anxiety: It sounds like you have no physical problem having an orgasm. You could be getting performance anxiety. Discuss it with your fiance and try different "things" to arouse you in the moment. Don't be afraid to get a sex therapist if needed. Good luck.