Mia: Dude, don't ignore the signs. You may be okay with the way things are now but what if she adds on more rules you have to follow? Think about easing out of the relationship and finding someone who's not a germaphobe. You don't have to leave her today. But it might be a good idea to not invest too much going forward and to start planning an exit.
Steve: You are not confused, she is and needs mental help. You need to put distance between yourself and Ms. Clean.
Mia: Oh that's easy! Immediately cease all tongue play. When he asks you why, tell him what you just told us. Don't be mean about it. Then grab his face demonstrate how you want him to kiss you. Have fun!