A visiting professor at Bob Jones University was delivering a lecture on the supernatural.  To get a sense of his audience's reactions, he asked "How many people here believe in ghosts?"  About 90 students raised their hands.

"Good, good.  Out of those who initially raised their hands, how many of you think
you've actually seen a ghost?"  Some 40-odd students raised their hands again.

"Excellent.  I'm glad to see so many here taking this seriously."

"Tell me, now, has anyone ever talked to a ghost?"  15 students raised hands. "What a wonderful response.  Has anyone here ever touched a ghost?"  Up go 3 hands.

"Excellent.  But let me ask another question, an unusual one, perhaps.  Did any of those who touched ever make love to a ghost?

Way in the back of the audience, one student raises his hand.  More than surprised, the professor removes his glasses, takes a step backwards and says, "In all my years of lecturing on this subject, no one has ever claimed to have had sexual relations with a ghost.  Please, you must come up here and tell us all about your experience."

The student nods, breaks into smirk and starts ambling towards the podium.

"Tell us, what was it like to have sex with a ghost?"

The student stops dead in his tracks.  "Ghost?  Sorry.  From way back there I thought you said goat."