It's a picture of Joseph and Mary in bed together.
By Christian tradition, they were a married couple, so there is nothing wrong in that depiction.
What exactly is it that everyone finds so offensive here?

And verisi, I knew there was a reason I liked you...
You're right. I have no taste.
;-p

"If you're looking for sympathy, you'll find it between sh*t and syphilis in the dictionary."
- David Sedaris