You want a President who is faithful to his wife, vote for Jimmy Carter.
Yes but Paul, Romney, Perry, Santorum, Bachman, and even the early drop out from MN would also fit that bill. I’m in year one of my marriage - no where near understanding either the difficulties or rewards - but many folks do keep it in their respective pants - seems like we could get one for a nominee.
P.S. “I don’t cheat on my wives and ditch them when their sick” is a pretty powerful tool to give campaigners like Obama/Axelrod. Think it over.