And when the person who is feeling the kissing really, really likes something he or she says, 'Ooo, I like that, do that more'. Or, 'Oh my God that's great', remember doing it that way. That way you can concentrate on the positive, not the negative, and somewhere in all those spots with all those different kinds of pressure, and with all those different levels of mouth open or closed, you can find something that you really like. Concentrate on his strengths. Instead of focusing of what somebody did that he doesn't do or do as well.
Nobody owns every strong point that exists on earth.
And give your partner credit for what he does well, and then think about ways you can teach him to do the things he doesn't do well better. But don't torture yourself or undermine him by keeping other guys in your mind all the time. You chose him to marry, he must have something that no one else had. If there is a real problem, that is if he's really sexually untalented, then go see a sex therapist or work together on the things that need improvement. Most people who cheat do it once or twice in their lifetime.