dmills, this is just my two cents. Some folks don't care for it, if he's tryed it, don't bug him about it, try to turn him on to it once in a while. Use a toy, show him how good it feels to you! Maybe it will turn him on to it!
As a gay guy, I love it haha. Its obviously different for a guy and a lady though. But being realistic, I can see why it is scary or odd.. But I recommend trying it at least* once by someone with experience in the matter <3