OP, I am guessing husband is going through a midlife crisis and he’s feeling dissatisfied with his life - And this is one of the symptoms… Midlife can be a bitch - For males or females. But there is a difference between fantasy and reality and most people know the difference even when they are going through a midlife crises. If this is just a fantasy with no intention of acting on it, don’t pay too much attention to it. If you want to play along get a wig that looks kind of like the fantasy… On the other hand if this looks like the beginning of a bigger crisis then pay attention but don’t act on it until there is reason… BTW - Having been there before, somewhere around mid life it occurs to you that your life is half over. You start wondering if life could be better or more fun. If you are dissatisfied you start thinking that it’s your last chance to find the life you really wanted. The phase passes but sometimes with a crisis…

Tell him to keep dreaming.

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tell him you wanted a rich man with a huge member but we can't always get what we want.