Teaching controversial matter
I asked each student to create a postcard-sized artwork to be sent to another student through the mail. Students had to investigate something they feared, something they loved, or if they were really ambitious, both. They also had to consider that this work would travel through the United States Postal Service and the student who received it would respond with another piece of mail art.
One student sheepishly presented two postcards. One of his postcards featured a detailed graphite rendering of an erect penis and, on the other side, a vagina. The second postcard featured a red background with stick figures in different sexual positions with a white substance smeared on the other side (it was Elmer's glue.)