A professor was giving a talk on the paranormal to a group of students at an University. He asked them "Does anybody here believe in ghosts, if you do please put your hands up" About half the class raised their hands. He then asked these "How many of you have actually seen a ghost" About ten people put their hands up.Then to those ten he asked "How many of you have had sex with a ghost. " One male student put his hand up. The professor said would you like to come up on the stage and tell us about your sex with a ghost. "Oh" he said "I thought you said sex with a goat"