Captive (2008)

It's implied that a woman was having sex with someone; she is topless, breasts are clearly seen.

A man lying naked under a sheet gets up and puts on pants, butt-cheek and some pubic hair are shown. A woman comes in and tries to change clothes. The man grabs her breasts, which are visible, and kisses them. The woman is hesitant but enjoys it too. An attempt to have sex is refused. Her breasts remain visible.

After that the woman can be seen sitting in his lap. The man grabs her left breast which his covered. He kisses her and wants to go further but she refuses once again.