One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process.
Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms.
It showed them ordering food and messing around with a yellow cleaning cone, before Hirst performs oral sex on Smith.
After this, the couple have sex leaning on the counter close to the till.
They all must've taken something about the characters in the script, because for all the flaws and misconceptions and fears these characters carry, they are human.
Even Gallagher's John, who's the conniving husband and lawyer, is recognizably as he is even when he's comparatively lesser than Graham and Ann.
The gametes produced by an organism are determined by its sex: males produce male gametes (spermatozoa, or sperm, in animals; pollen in plants) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic.
Only one side character, the barfly played by Steven Brill, gets the film to immediately halt with uncomfortable humor.
But the rest of the film, loaded with innuendo (there's not one shot of nudity, similar to a Rohmer film like Chloe in the Afternoon, where the cover art of the film is rather misleading to those looking for a film with breasts and other parts) and involving drama, doesn't shake its foundations until maybe the last five to ten minutes.
Ann is married to John, who is having an affair with her sister Cynthia.
Ann's a quiet type and unwilling to let herself go.