On one end of the “purity” spectrum we have the Purity Bear, who pops up at the end of a date to save some young people from the dangers of kissing (see Drek’s dissection, and also note that since the bear is black it may be a magical negro):
At the other end of the spectrum we have the Walk of Shame Shuttle, which seems to be part joke and part real:
Memoirs of a SLACer 