A Northwestern University human sexuality professor has defended an optional live-sex presentation he held on the campus grounds after class. But, has he gone too far?

Bailey has released a statement, defending the controversial after-school demo. To read Bailey's statement, click here.

Last week, professor John Michael Bailey invited students from his human sexuality class for the optional demonstration that featured a naked non-student woman being stimulated with a motorized sex toy on stage.

According to Northwestern Daily, about 120 students attended the after-school demonstration, which was curated by Chicago sex tour guide Ken Melvoin-Berg.

The professor reportedly warned interested attendees several times about the intense nature of the demonstration, and the students were urged to walked out before the event if they were worried about being uncomfortable.

I think that these after-class events are quite valuable. Why? One reason is that I think it helps us understand sexual diversity, Bailey said in recording of the lecture obtained by the Northwestern Daily. Sticks and stones may break your bones, but watching naked people on stage doing pleasurable things will never hurt you, he said.

One student told the local media that the female model, just out of nowhere, simply began removing her clothing and then started her demonstration. As long as there's been proper warning, the people that stay shouldn't feel offended, Pratik Shah, a senior math and economics student said. They're choosing to see what they're seeing.

Northwestern's Dean of Students Burgwell Howard told the paper by e-mail that though somewhat surprised by the demonstration it likely falls within the broad range of academic freedoms - whether one approves or disapproves.

According to Northwestern Daily, Laura Anne Stuart, the sexual health education and violence prevention coordinator at University Health Services, said after hearing of the event she consulted with a few members of SHAPE, the on-campus sexual health group she advises.

As a sexuality educator, I do think that demonstrations of specific arousal techniques — those definitely have educational value, she said.

Northwestern police would be responsible for determining whether the demonstration violated any local ordinances, said a report from the Chicago Tribune, quoting an Evanston police department spokesman.

The Chicago Tribune report said some Northwestern students questioned the necessity of last week’s demonstration, but said they weren’t bothered by it. “I think it’s going a bit over the top, but because it was optional and the students were warned, it’s OK in that sense, said Tegan Reyes, 19, a freshman.

Another student Ryan Naylor, 18, not enrolled in Bailey’s class said he thought the demonstration “was really inappropriate.” “I wouldn’t have been comfortable with it,” he said.