Butler Sex refers to the act of hooking up in Butler Library. Most hookups occur in the stacks after hours ("staxxion"), accessible through the basement. This much mythologized subculture of Columbia is driven by the unique pressurized scene that makes Butler a petri dish for desperate social interactions.
Many a Butler hookup has been coordinated on Craigslist or on Bored at Butler.
Having sex in the Butler stacks is one point of the Kings Quest challenge.