Shadowlocked - So it’s sex ed week at McKinley High and it turns out that for as much a preoccupation it may be, no one knows a damn thing about it. Holly Holiday returns (the real-life reasons for which make me nauseous) to sub for the Health teacher, who apparently didn’t take her own advice regarding STDs. Santana is struggling with her feelings for Brittany while Emma and Carl’s marriage is exposed for the sham it is. Meanwhile, Blaine makes a strange request of Burt for Kurt’s welfare and Puck considers making a sex tape with Lauren. Best of all, Rachel doesn’t have a solo! Unfortunately, Holly does.