Two bottoms dating
Depending on the context, exposure of the buttocks in non-intimate situations can cause feelings of embarrassment or humiliation, and embarrassment or amusement in an onlooker (see pantsing).Willfully exposing one's own bare buttocks as a protest, a provocation, or just for fun is called mooning.There are several connotations of buttocks in art, fashion, culture and humor, and the English language is replete with many popular synonyms that range from polite colloquialisms ("posterior" or "bottom") to vulgar slang ("arse," "bum," "prat").In humans the buttocks are located between the lower back and the perineum.For example, terminating an employee may be described as "firing his ass".One might say "move your ass" or "haul ass" as an exhortation to greater haste or urgency.In many cultures, they play a role in sexual attraction.
However, the qualities that make buttocks beautiful or well-formed are not fixed, as sexual aesthetics of the buttocks vary considerably from culture to culture, from one period of fashion to another and even from person to person.
In the case of humans, females tend to have proportionally wider and thicker buttocks due to higher subcutaneous fat and proportionally wider hips.
In humans they also have a role in propelling the body in a forward motion and aiding bowel movement.
Some baboons and all gibbons, though otherwise fur-covered, have characteristic naked callosities on their buttocks.
While human children generally have smooth buttocks, mature males and females have varying degrees of hair growth, as on other parts of their body.
The gluteus maximus has two insertion points: superior portion of the linea aspera of the femur, and the superior portion of the iliotibial tractus.