 Ways of life often viewed as more rigid , such as soldiers and religious cultures , frequently have explicit rules regarding hair length . For example , Buddhist monks shave their heads as part of their order of worship . Similarly , religious men with long hair include the Nazarites of the Hebrew Bible ( Samson being a famous example ) and the Sikhs . Subservient cultures may view male long hair negatively , and are sometimes detected by their rulers through hair length , as was the case with the Gaelic Irish under English rule and the Moors under Spanish rule in Medieval Spain . 
