Some of the content of the play itself is quite vulgar. For those who do not have the link:
P.S. I should commend you on these plays you're doing. Vulgar or not I love them.
Vulgarity is not based on if a wiki page is vulgar that your character included in a letter. Those who said it was vulgar may have, but i am quite sure its not meant to be. And yeah I love them too.