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I agree with cascaralli. If you�re enjoying masturbating then you haven�t gone off sex; just sex with your partner! You definitely need to make it more interesting in that case. What arouses you when you masturbate? Think about what turns you on and then sit down with your partner and have an open discussion and tell him. Dressing up, role play, toys, kinkiness etc. can all add spice and re-inject the passion. If your man is a hot blooded male then he will be more than happy to accommodate your fantasies.
Also, invest in a couple of good books, e.g. The Woman's Book of Orgasm: A Guide to the Ultimate Sexual Pleasure by Tara Barker, or The Best of Best Women's Erotica by Marcy Sheiner.