upon further examination...
This is a true delemma. Here's how I make tough decisions along the way. If my honey doesn't fulfill 75% of my expectations in ANYTHING, be it sex, companionship, parenting, spiritual, income, time alone, communication...whatever, then I examine closely. You've asked a very important question at the perfect time...BEFORE MARRIAGE. Well done. Wish more women examined their relationships as closely and honestly as you. If OS is truly that important to you now, it will be magnified 10 fold when married, and you will use it against him. Yes you will. This one item will become an arguement point even though he satisfies you in every way other than with thy tongue. Count on it. Only you can answer yes or no if this could be a major problem down the line and force unnecessary pain and suffering to both of you. If you marry him expecting the tongue, knowing he doesn't tongue, then you deserve no tongue. He won't change. Believe me, this is who he is. He doesn't like the taste of tuna, like many guys out there. Maybe you should find a guy who loves it. He'll probably lack some of the special qualities that this guy has, but at least a priority will have been met. Maybe this guy now has a sweet, decent personality but won't lick you into orbit. The next guy may be a sarcastic prick but loves to go down and make you go up. You make that call...taking the good with the back. Weigh the good vs. bad qualities and proceed from there.