Dear Prudence (2010)

During police interrogation the girls strip. One down to panties with breasts exposed (she's not wearing a bra) and the other to bra and panties. First breasts exposed for a few minutes during interrogation.

One girl comments on another breasts having grown and she raises her shirt and bra in a mirror to expose her breasts and they examine them for a minute or two. The other also exposes her breasts to compare and they're shown briefly.

Two girls talk about what they've done sexually.. sex, blowjobs, handjobs.

One girl listens as another has sex. It's heard but not seen.

A mom comes into a room to her daughter sitting around in just her panties, breasts exposed. They talk for a bit and the daughter talks about just losing her virginity.

A guy and girl make out. She puts his fingers in her mouth and then down her pants.

A girl gets ready, breasts shown.

Guy and girl take off each other's clothes. The scene then jumps to them lying in bed naked, presumably after sex. Her breasts shown.