First Gentleman has a certain ring to it.
China Doll...I'll accept that Putin can be considered 'hunky', I'll even go as far as saying that Blair had a certain je ne c'est quoi.
But Bill Clinton?
You've just crossed the line. The invisible line that divides good taste with...with...being certifiable.
First Gentleman sounds right, but my guess is the US political establishment haven't come up witbh a title.
A quick Google search on came up with:
http://billforfirstlady.com/
Admittedly, a very funny site - but not at all helpful.