Nude photography is the creation of any photograph which contains an image of a nude or semi-nude person, or an image suggestive of nudity. Nude photography is undertaken for a variety of purposes, including educational uses, commercial applications and artistic creations. The exhibition or publication of nude photographs may be controversial, more so in some cultures or countries than in others, and especially if the subject is a minor. Nude photographs may be used for scientific and educational purpose, such as ethnographic studies , human physiology or sex education. In this context, the emphasis of the photograph is not on the subject, or the beauty or eroticism of the image, but on the educational or demonstrative purpose for which the image was produced.