The scene pictured above featured the characters Desi and Marnie—the latter played by Allison Williams, daughter of NBC newsman Brian Williams—performing some iteration of anilingus, which has been around for a lot longer than one weekend. According to Dr. Jordan Rullo, a certified sex therapist at the Mayo Clinic in Rochester, Minnesota, an ass-licking rim job is definitely something people enjoy, but exactly how many people do it is unknown. Rullo says. I would guess that these would be the individuals who would be more likely to try oral-anal contact. But rimmer beware: It may not be entirely safe. If safety is a concern, you should check out our Guide to Anal Sex.