All students are required to sign a pledge stating they will live according to the university's honor code. Prohibited activities include lying, cursing, smoking, drinking, and a range of sexual acts, including homosexual behavior and sex outside marriage. In early 2003, the student dress code was relaxed for the first time in 40 years and described as business casual. For most of the school's history, men were required to wear collared shirts and ties and women were required to wear skirts (an exception for winter months was added in 2000). In 2006, campus-wide dress code rules were eased further, allowing students to wear jeans to class and dress more casually in non-academic settings. Since 2009, men are allowed to have neatly trimmed facial hair. Restrictions on men's hair length were relaxed in 2013.