sunbathing areas; when exercising outside in hot weather; and in certain outdoor construction work settings. However, some stores and restaurants have a "no shirt, no service" rule to prevent barechested men from coming inside. While going barechested at outdoor activities may be acceptable, it is taboo at office workplaces, churches and other formal settings. In most societies, male barechestedness is much more common than female toplessness, even among children. Exposure of the male pectoral muscles is often considered to be far less taboo than of the female breasts, despite some considering them equally erogenous. Male barechestedness is often ascribed to practical reasons such as heat, or the ability to move the body without being restricted by an upper body garment. In several sports it is encouraged or even obligatory to be barechested. Barechestedness may also be used as a display of power, or to draw attention to oneself, especially if the upper body muscles are well-developed. Traditional societies Attitudes towards toplessness have varied considerably across cultures and over time. The lack of clothing above the waist for both females and males was the norm in traditional cultures of North America, Africa, Australia and the Pacific Islands until the arrival of Christian missionaries, and it continues to be the norm in many indigenous cultures today. The practice was also the norm in various Asian cultures before Muslim expansion in the 13th and 14th centuries. India In certain parts of northern India, some women did not wear an upper garment except during winter before the Muslim conquest of India. Women and men typically wore an antriya on the lower body and were nude from the waist up, aside from pieces of jewelry. This was the standard form of dress unless women opted to wear a sari, in which case they covered their upper bodies with a robe. Toplessness was the norm for women among several communities of South India and Sri Lanka until the 19th or early 20th century. Such communities included the Tamils along the Coromandel Coast, Tiyan and other peoples on the Malabar Coast, Kadar of Cochin Island, Toda, Cheruman (Pulayar), Kuruba, Koraga, Nicobarese, and the Uriya. Thailand In Thailand, the government of Field Marshal Plaek Pibulsonggram issued a series of cultural standards between 1939 and 1942. Mandate 10 issued on 8 September 1941 instructed Thai people to not appear in public places "without being appropriately dressed". Inappropriate dress included