" So my question is: do doctors routinely slip porn into a presentation about a clinical studies trial? Does a lawyer slip porn into his slides for his closing remarks? Does anyone honestly think either of those would go over well?"

The point is not everyone agrees those images are "porn". And if they were, that it is inappropriate to do so.

People have a range of opinions from "utterly disgusting" to "wtf? It is just a presentation at a conference."

That is the "problem".