Anything you can do on SmugMug can be done on Facebook...
Most that want to do that I have found are asians thinking SmugMug should have been Facebook though.
Sounds to me you have no issue sharing pics, you just don't want to / don't know how to use Facebook.
Sucks your wife is your slave though. I am glad I have bigger balls than that and work based on she does what she wants and I do what I want. When that doesn't work then we decide to accept or move on, not coerce.