Sex in film refers to the presentation in motion pictures of sexuality and sex acts, including love scenes. Sex scenes have been depicted in film since the silent era of cinematography. Many actors and actresses have exposed parts of their bodies or dressed and behaved in ways considered sexually provocative by contemporary standards at some point in their careers. Some films of the sexual nature have been criticized by religious groups and/or banned by governments because of the amounts of sex scenes. Sex in film should be distinguished from nudity in film, though often nudity is presented in a sexualised context. For example, a film on naturism or about people where nudity is common may contain non-sexual nudity. Some people distinguish between "gratuitous sex" and sex scenes which are presented as integral to the film's plot. Sex scenes have been presented in many genres of film. Sex scenes are the main aspect of pornographic films. In softcore films, sexuality is less explicit. Erotic films are suggestive of sexuality, but need not contain nudity. In some genres of film sexuality is rarely depicted.

Margaret Ruth "Maggie" Gyllenhaal ( /ˈdʒɪlənhɔːl/; born November 16, 1977) is an American actress. She is the daughter of director Stephen Gyllenhaal and screenwriter Naomi Foner Gyllenhaal (née Achs) and the older sister of actor Jake Gyllenhaal. She made her screen debut when she began to appear in her father's films. Gyllenhaal achieved recognition in a supporting role in the indie cult hit Donnie Darko (2001). Her breakthrough role was in the 2002 sadomasochistic romance Secretary, for which she received critical acclaim and a Golden Globe nomination.

Gyllenhaal has appeared in an eclectic range of films, including the indie film Sherrybaby (2006), for which she was nominated for a Golden Globe, the romantic comedy Trust the Man (2006), and big-budget films such as World Trade Center (2006) and The Dark Knight (2008). She next starred in the 2009 musical-drama Crazy Heart, for which she was nominated for an Academy Award for Best Supporting Actress. Gyllenhaal has also appeared in theatrical plays, including Closer (2000), and television productions, including Strip Search (2004).

Kate Elizabeth Winslet (born 5 October 1975) is an English actress. She was the youngest person to accrue six Academy Award nominations, and won the Academy Award for Best Actress for The Reader (2008). She has won awards from the Screen Actors Guild, British Academy of Film and Television Arts, and the Hollywood Foreign Press Association among others, and has been nominated twice for an Emmy Award for television acting, winning once for her role as Mildred Pierce in the 2011 mini-series of the same name.

Brought up in Berkshire, Winslet studied drama from childhood, and began her career in British television in 1991. She made her film debut in Heavenly Creatures (1994), for which she received her first notable critical praise. She achieved recognition for her subsequent work in a supporting role in Sense and Sensibility (1995) and for her leading role in Titanic (1997), the highest grossing film at the time, and the highest grossing film of Winslet's career.

Since 2000, Winslet's performances have continued to draw positive comments from film critics, and she has been nominated for various awards for her work in such films as Quills (2000), Iris (2001), Eternal Sunshine of the Spotless Mind (2004), Finding Neverland (2004), Little Children (2006), The Reader (2008) and Revolutionary Road (2008). Her performance in the last of these prompted New York magazine critic David Edelstein to describe her as "the best English-speaking film actress of her generation". The romantic comedy The Holiday and the animated film Flushed Away (both 2006) are among the biggest commercial successes of her career.