Cialis

Cialis is a medication for erectile dysfunction. It was seen briefly in the Season Sixteen episode, "Insecurity".

Background
Gerald and Sheila Broflovski are watching television in bed, when a Cialis commercial beings airing. The narrator notes that Cialis would allow a male to 'fake' his sex drive for up to 3 hours, regardless of how unattractive his partner is. Upon conclusion of the commercial, Gerald proceeds to 'role-play' as the 'UPS man'.