I'm offended and angry, how do I communicate it to my husband

If I am to take your description of this photo to be precise then all I can say is that the man that would publicize photos of himself in such a compromising post lacks good judgement. Sorry....don't mean to offend you by suggesting that about your significant other but either you are over exaggerating or he is not wise.

Maybe he showed you because you are the closest person in the world to him and he should feel comfortable sharing everything with you.

Maybe he showed you because he saw no harm in what was happening in the pic because the participants were just acting for the camera.

The only reason he would not show you would be if he had something to hide.....if there was guilt associated. But there wasn't. You should trust him and believe that.

These are feelings that you need to share with him. Just tell him that you feel hurt that he dismissed your feelings. What's the difficulty in that?

Are you afraid that he's gonna think you don't trust him? If he does bring that up then reassure him but tell him that there is such a thing as "too close for comfort" and that pic helped you to understand where that boundary is for you.

LOL. Yeah.
I can see that happening!!!!!

Good luck with the tit for tat approach.
Let me know how it works out.