Not counting the opening and ending credits, the film begins and ends with Ana giving Marcos oral sex.
Fellatio/Cunnilingus is performed by gay/lesbian singles in the whirlpool bath, but straight Singles have sex.
His role is highly unusual in that he had unsimulated and very graphic sex with his co-star Margo Stilley including genital fondling, female masturbation, with and without a vibrator, penetrative vaginal sex, cunnilingus and fellatio.
The original music video for "Protège-Moi", directed by Gaspar Noé, was never officially released as it was too sexually explicit to be shown, featuring uncensored nudity, heavy petting, fellatio, and cunnilingus.