
Actual “show your school spirit” shirt sold by students to “support team.”
Via an anonymous and concerned parent.
ETA: To be clear, the parent is not anonymous to me, s/he simply prefers not to be named. Another artifact from the same rivalry, taken from the Jezebel comments thread:

–Ann Bartow
ETA2: The shirt was discussed by the Houston media, see e.g. here, here and here. For an eloquent exposition on rape jokes, go here.
[...] This post was mentioned on Twitter by sumshel and Ryan Tamares. Ryan Tamares said: RT @FeministLawPrfs New blog post: Pornification of a High School Sports Rivalry http://bit.ly/DdPzn [...]
[...] October 6, 2009 Filed under: Found — INTJ_librarian @ 1:13 pm Tags: sexism http://feministlawprofessors.com/?p=13251 I found this on Jezebel, but the image was originally submitted to Feminst Law Professor. [...]
[...] Now that sweeping disgust sprinkled with hate has, like an amoeba, absorbed high school athletics. Bestiality: A True Indicator of School Spirit Bestiality + Rape + Physical Shaming = [...]
[...] The Pornification of a High School Sports Rivalry [...]