At the main high school dance, one teenage girl lifts her skirt and while she's dancing, she lays on the floor and she goes underneath Danny's legs.
Despite the large amount of sexual references and stuff in the film, none of the teens look like teens as they are all played by adults.
A teenage boy lifts up a teenage girls skirt and her knickers are exposed.
A 19 year old girl lifts her skirt constantly at a school dance and exposes her black knickers.
Teenage girls are shown in panties and one girl spreads her legs and we get an eye full.
At a dance,several teenage girls panties are shown when there dresses fly briefly.
Three teenage boys moon a TV camera and you a see male butts briefly while some people watch the show.
One teenage girl makes fun of another teenage girl's virginity in a song.
A teenage boy (John Travolta) tries to put his hand on Sandy's (Olivia Newton John) right breast but doesn't happen.
At night, teens are making out, one teen couple kisses and cuddles in the back seat of a car (they are fully clothed.) The high school girl says "you got something for me." The high school boy, pulls out a condom (not shown) and later comments that it broke. Kids will most likely not understand what they are talking about as the condom isn't seen, nor is it explicitly referred to in dialogue.
A teen girl asks a teen boy if he's going to "flog his log."
A teenage boy looks up at teenage girls skirts.
Sexual references that are meant to be funny to the viewers.
The song "Greased Lightning" has some sexual references.