"Experiences with ghosts" joke

A professor at the University of Kentucky is giving a lecture on the supernatural. To get a feel for his audience, he asks:
"How many people here believe in ghosts?" About 90 students raise their hands.
"Well that's a good start. Out of those of you who believe in ghosts, do any of you think you've ever seen a ghost?" About 40 students raise their hands.
"That's really good. I'm really glad you take this seriously. Has anyone here ever talked to a ghost?" 15 students raise their hands.
"That's a great response. Has anyone here ever touched a ghost?" 3 students raise their hands.
"That's fantastic. But let me ask you one question further...Have any of you ever made love to a ghost?" One student way in the back raises his hand.
The professor is astonished. He takes off his glasses, takes a step back, and says, "Son, all the years I've been giving this lecture, no one has ever claimed to have slept with a ghost.
You've got to come up here and tell us about your experience."
The redneck student replies with a nod and a grin, and begins to make his way up to the podium.
As he ambles slowly toward the podium the professor says, "Well, tell us what it's like to have sex with a ghost."
The student replies, "Ghost?!? Shiiiiiit...
From way back there I thought you said "goats."