Eternally inappropriate

I work with a chap who's eternally inappropriate. He seems to have no ideas that what he says is just, well, not quite on.

For example, today we were in a meeting discussing options for raising some money by asking companies to match fund a project. I know the managers of both of the specific companies being considered. This apparently made me blush.
I am one of those blushing people. It's a curse.

Anyway, in response to said blush Mr Eternally Inappropriate said,
"Why are you blushing? Are you having an affair with someone who works there?"

!!

As it so happens I am in a l/t relationship with someone who works there, but that is not the issue.