Just . . . Owch.
Thats actually a reasonable situation for envy.
I know NRE is a powerful force in the bedroom and the start of a new relationship get alot of the off the wall crazy fun things to pop out in the bedroom, but still most people develop a preference for at least some of those things with the primary/spouse/whatever just due to practise-and-perfection.
That kind of sexual ADD on the other hand is something I've never run across.
I'll agree with dingedheart, and novemberRain. Get out there and find someone a little less . . . I dont know what to even term that . . . Damn.
Find someone who will meet you a little closer than 110% : 5%. I have a hunch that might start bringing the ratio with the wife a little closer to the middle as well.