I guess I am different on here, but keep in mind my wife have never lived out the lifestyle either.
I do not routinely share nude photos of my wife, though I have to a very few select friends...three so far. What I do routinely is, share VERY suggestive photos of her, but hold judgement yet, as I am not the jerk husband you think I am. She knows I share them, because well she is so quick to pose for them.
Now granted they are not completely nude, but once after installing a boiler in our house, the guys on a forum who helped me install it properly, knowing my wife is pretty...asked me to post some pictures of her beside the boiler so they could "see which one was better looking." I told my wife, and she put on her red microdress knowing full well that the who photo shoot was for strangers online and had a blast. Now this was not the first photo shoot we have done that was spicy.
So honestly, I think she gets a sexy thrill from knowing very risque pictures of her are online for people to see, but she is so shy that she could never bring herself to admit it.