You can be a very astute lover when you are in tune with your partner. But that can't always happen, and you must learn to adapt to other styles of loving at times in order to truly please your lover.
You tend to be sexually faithful to your lover because you don't want to keep changing your style for various partners. You will be much happier if you develop and refine one love relationship to the point of true artistry rather than diffuse your energies without real accomplishment.
You probably prefer having fairly specific boundaries of sexual expression rather than an emotional or physical free-for-all.