Christian naturism is the practise of naturism or nudism by Christians. Given the outdoor nature of nudism/naturism a beach version of volleyball was naturally adopted. The numerous nude sunbathers, and the long tradition, make it safe for nudism and naturism. Several activists, such as Vincent Bethell, claim that associations with naturism or nudism are unnecessary. In 2004, she was named "Naturist of the Year" by British Naturism. For example, nudity in the context of naturism would normally be regarded as non-sexual. In today's Poland naturism is practiced in number of the seaside and inland beaches. Jacque de Marquette wrote on naturism and vegetarianism. Croatia is world-famous for naturism, which accounts for about 15% of its tourism industry. Emile Armand advocated naturism (see anarcho-naturism) and polyamory. He advocated naturism and polyamory in what he termed "la camaraderie amoureuse". Belgian naturism was influenced in equal part by French naturism and German . Given the outdoor nature of naturism, a beach version of volleyball was naturally adopted. The following are beaches where naturism is practised. Thoreau was also an important influence on late-19th-century anarchist naturism.