As Meatwad says, "I ain't no bi-curious!"
Actually, until fairly recently I was, and then I realized I really do like women...there's no curiousity about it
They do give you something men don't, and you're definitely not a freak for being interested. However, as emotional suggested, communication is key--your spouse needs to know about your curiousity. There are a lot of other bi/bicurious women on this board, and so I know you'll get a lot of support and help if you ask for it.