Why would someone object? To say they are narrow minded, old fashioned, a prude is an easy assumption. Each one has their own reasons for objecting. Here are mine: First, this is a state college. By paying tuition you do not cover the entire cost of your classes. A goodly portion of the cost is paid by the taxpayers. So, as a taxpayer, I have a right to have an opinion about how my tax dollars are spent to educate my fellow citizens. Second, the study of human sexuality is to understand, not necessarily to experience, what is involved in human sexuality. What I see is far more real and impactful that what I imagine from reading in a book, and what I experience is even more impactful than what I see. By including an explicit video, the instructor has taken learning from assimilating information to a visual experience and, likely, a physical response to human sexuality. Of course people respond physically to watching someone else have sex (otherwise why would there be a multi-billion dollar porn industry?). Why must that be included, even optionally, in a class?  I see no reason that my tax dollars should provide that experience for others.