My friend, listen to me. Am a guy as well and I know what guys don't like. Some people will say do it. But if you know what will be coming before in future the moment you open your legs to your fiance's father, you won't dare it. Not even to think of it. If you try it then you have just prove to the father that you are irresponsible. Think about it.
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If you are afraid to tell your fiance this abominable secret, you have started betraying him already. And if you insist and give yourself to his father; don't be stupid because no secret ever hides forever. Do you think you can cheat nature? You are not a child, my friend. If you dare that mess, in future, your marriage will not be safe. You can't imagine the hatred your fiance will have for you. And you might end up losing him at last. Don't act like a fool my friend.