It is generally accepted, at least in western countries, that a naked human body is not in itself indecent. That principle is reflected, for example, in depiction of the human form in art of various forms. Nevertheless, as a general rule, it is also commonly expected that people when they appear in a public place will be appropriately attired. Inappropriateness is viewed in context, so that, for example, what may be appropriate on a beach may be inappropriate in a street, school or workplace. Depending on the context, some degree of inappropriateness may be tolerated, and perhaps described as eccentric, but in extreme cases of inappropriateness it may be regarded as "crossing the line". Besides the social disapproval of such a state of dress, most jurisdictions have laws to "maintain social order", variously described as public nudity, indecent exposure, as an affront to public morality, public nuisance, besides others. What is an inappropriate state of dress in a particular context depends on the standards of decency of the community where an exposure takes place. These standards vary from time to time and can vary from the very strict standards of modesty in places such as Afghanistan and Saudi Arabia, which require most of the body to be covered, to tribal societies such as the Pirahã or Mursi where full nakedness is the norm. There is generally no implication that the state of dress objected to is of a sexual nature; and if such an allegation were to be made, the act would generally be described as "gross indecency".
The standards of decency have varied over time. During the Victorian era, for example, exposure of a woman's legs and some extent the arms, was considered indecent in much of the Western world. Hair was sometimes required to be covered in formal occasions as in a form a hat or bonnet. As late as the 1930s and to some extent, the 1950s, both women and men were expected to bathe or swim in public places wearing bathing suits that covered above the waist. An adult woman exposing her navel was also considered indecent in the West into the 1960s and 1970s, and even as late as the 1980s. Moral values changed drastically during the 1990s and 2000s, which in turn changed the criteria for indecent exposure. Public exposure of the navel has been accepted during the 1990s, such as in beaches, while in the 2000s, the buttocks can be exposed while wearing a thong. Today, however, it is quite common for women to go topless at public beaches throughout Europe and South America and even some parts of the United States.
Although the phenomenon widely known as flashing, involving a woman exposing bare nipples by suddenly pulling up her shirt and bra, may be free from sexual motive or intent, it nonetheless is public exposure and is therefore defined by statute in many states of the United States as prohibited criminal behavior.
The motivation of the exposure is sometimes based on it being unusual, attention-getting, sexually arousing, or separately, as in a public policy protest, inappropriate and to show disrespect to the enemy side. The effects (including negative consequences) may be enhanced by intended or unintended publication of a photograph or film of the act, which would also include mooning.
Breastfeeding in public does not constitute indecent exposure under the laws of the United States, Canada, Australia, or Scotland. In the United States, the federal government and all 50 states have enacted laws specifically protecting nursing mothers from harassment by others. Legislation ranges from simply exempting breastfeeding from laws regarding indecent exposure, to outright full protection of the right to nurse.