It's traditional at my school to put up a huge poster when a new member class pledges or is initiated - example: "Alpha Epsilon Phi welcomes our new sisters" followed by their names.
One day I saw a poster that some idiots had hung, reading "Sigma Tau Delta welcomes our new sisters" followed by a list of names that were plays on the names of sexually transmitted diseases. Yuck. Next day, the poster was gone, thank goodness...
We did not have Sigma Delta Tau on campus, but one of my sorority sisters has a bio sister who's a member of SDT, and she gets STD jokes all the time.

She also gets idiots asking her why she's wearing a sweatshirt that says "EAT"