Overview: Sam decides to take her relationship with George to the next level, and he gets scared and says they should wait until they're both ready. Bobbi Glass decides to make all her students act in a play she wrote herself (""That Burning Sensation: A Cautionary Tale"") about STDs, as a part of the ""National STDs Week"". The students are cast: Lily as gonorrhea; April as syphilis; Josh and SD are worrisome warts; Mary Cherry and Nicole are crabs; Brooke is herpes; Carm is unsightly yellow discharge and Sam gets the part as the whore, with Harrison (now back at school) as the lonely virgin. Josh and Sugar decide to give Harrison a ""virgin certificate"", since he is the only virgin boy in the group, but he gets offended and embarrassed. Instead of taking the certificate, he decides to ask Nicole to sleep with him, but she says no. so he decides to use his certificate, but the prostitute is so old that they decide just to have Chinese food instead. Lily runs into George at a clinic and finds out he