There are at least three sex scenes in the film, two of them has nudity while the third one doesn't.
There's a semi-nude sex scene in the beginning of the film. Ali is shown on top of Callum and kisses him passionately (both fully clothed). The scene then cuts to Callum going down on Ali (female breast and male rear nudity) and she moans. Callum then has sex with her missionary-style. The entire scene lasts for a minute and a half.
Ali and Callum have sex while in a pool involving erotic asphyxiation when he chokes her and she seems to feign passing out. Ali later swims away, revealing breast and rear as only nudity.
Nearing the end of the film, Ali and Callum have sex fully clothed. Scene lasts for 30 seconds.
This was listed as TV14. In the beginning is a full on completely nude sex and oral sex scene.
Young woman comes on to an older drunk man as he is walking home. She attempts to unzip or remove his pants and he resists saying: "this is not the place." Seduction is interrupted.