A look given when one person wants to sex someone else up, usually with tongue stuck out, and head leaned back. Originated from a French class.
Look at Paula giving Zach the sex look... she so wants him
A very flirty look usually given by girls telling the guy/girl being looked at that you want to have sex through facial expressions
Man that girl is fine!! She's got to be into me 'cuz she's giving me the sex look.