Gillian Anderson showing both breasts during a nude sex scene with a guy in bed, showing hard nipples while they have sex and while lying on her back afterward.

Hera Hilmar - An Ordinary Man

Lydie Denier taking off her robe to go topless, showing her breasts as pulls down her lingerie top and then pushes her stockings down her legs as a guy watches.

Florence Pugh - Lady Macbeth http://www.imdb.com/name/nm6073955/

Michelle Williams - Blue Valentine

Shannyn Sossamon of A Knight's Tale fame sitting topless on a couch blindfolded giving us a good look at her left breast as a guy leans down to kiss her neck and she reaches up behind his head.