Ghost sex
At a conference on the supernatural, one of the speakers asked, "Who here has ever seen a ghost?"
Most of the hands go up.
"And how many of you have had some form of interaction with a ghost?"
About half the hands stay up.
"OK, now how many of you have had physical contact with a ghost?"
Three hands stay up; there's a slight murmur in the crowd.
"Gosh, that's pretty good. OK, have any of you ever, uh, been intimate with a ghost?"
One hand stays up.
The speaker blinks. "Gosh, sir, are you telling us that you've actually had sexual contact with a ghost?"
The guy with his hand up suddenly blushes and says, "Oh, I'm sorry, I thought you said 'goat.'"