YES.

To put it in a way even my SO will understand, I tell him, "Listen, I just spent the last some odd hours with a large piece of plastic shoved up my crotch and now the last thing I want is something else shoved up there."

It's not that my saddle hurts, it's just like what you said, I think at the point after a long ride I get a bit desensitized.

And also, that's not to say at all that my libido has dissipated in general. It just goes on vacation for the span of 1-2 hours after a long ride. Maybe though that is my body's way of trying to retain some energy... (After that though, we're good to go! )