Hi, michelle666, and welcome! Remember, as you say, that no one is perfect. And I think marriage vows should be taken seriously. What you seem to be describing seems more like lust or some gut attraction to these other people. It will be important to make sure you can be satisfied with one person if you do marry. My two cents' worth anyway. Maybe you can talk to a therapist about this concern of yours and what to do if it does happen.