Kink.com, a porn production company in San Francisco, is offering sex-education classes with live demonstrations by porn stars, reports SFist.com.

The classes are offered in San Francisco’s Armory building and feature the live demonstrations following the lesson.

Porn star Rain DeGrey told SFist: “They have to sit through a lecture before we get to the good stuff. We do techniques, physical response and have a question and answer period before moving on to the demonstrations.”

The weekly classes have been going on for a few months.