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."