It's a Lifetime Network movie so there is no actual nudity shown.
In one scene, Arias does a strip-tease for Alexander in which she undresses to a bikini and touches Alexander on the chest seductively to suggestive music. This scene lasts for about 30-40 seconds, and several of the shots are close-ups.
A couple of scenes in which Arias and Alexander are making out heavily. This scenes include passionate kissing and caressing.
Multiple instances of Arias and Alexander in bed post-sex.
There are two scenes -- one in the beginning and one near the end -- of Arias lying around naked and moving across what's presumably either a bed or a couch, as she's filmed by a camera. It's implied that she's making a home-made porno with Alexander. There's no female nudity in this scene, but we see just about everything else.