"Two Freshman Philosophy Students" joke

Two freshman philosophy students see the following bulletin posted on the wall of their lecture hall:

Crash Course in Logical Assumptions
Saturday, September 26, 1998, All Day

Neither of them knows what it means and they are both curious. The pair decide to find the professor and ask some questions. When they locate the professor's office, the bolder of the two enter the building while the other remains outside.

Student: "Uh... Sir.. What does Crash Course in Logical Assumptions mean?"
Professor: "Well, it involves taking information that you have, forming assumptions using logic, and then creating new information. Let me try to answer your question by asking you a question. Do you own a car?"
Student: "Uh... Yes, I do."

Professor: "Well, then I can now logically assume that you drive."
Student: "Yes, I drive. "

Professor: "Then I can logically assume that you drive on weekends."
Student: "Yeah, I drive on weekends, I go out on dates."

Professor: "Then I can logically assume that you have date partners."
Student: "Well, yes, I have a girlfriend."

Professor: "Then I can logically assume that you are heterosexual."
Student: "Uh... hell yes! OK, I think I understand what this course is about now. Thanks a lot for your time."

Once back outside, his friend asks him: "So, what's it all about?"
"Its about using information and stuff... Let me answer your question by asking you a question. Do you own a car?"
"No."
"Uh... Then you're homosexual, dude!"