TV Trope: Covert Pervert

Annie: You’re going to change your shirt?
Jeff: Not if it’s working.
Annie: … It’s not working.
Jeff: You’re right, I knew it.
[Jeff strips off, Annie ogles him]
Student: I’ll have what she’s having.
Annie: Hey! Grow up, lady!
Britta: Annie!
Annie: Hisshirtwasn’tworking. 

(3.15 Origins Of Vampire Mythology)