What's driving more and more companies to implement policies that benefit lesbian, gay, bisexual and transgender workers? Many corporate representatives say it's just good business sense – such policies help attract a wider range of customers as well as skilled employees.

According to the Human Rights Campaign Foundation, a record 304 Fortune 500 companies achieved a top rating of 100 percent in its latest Corporate Equality Index. In the first CEI in 2002, just 13 companies achieved a perfect score.

To receive that perfect score, according to the Washington, D.C.-based HRC, a company must provide same-sex partner health benefits, have a non-discrimination policy to protect LGBT employees, offer transgender-inclusive medical insurance, have company-wide LGBT initiatives, and publicly support LGBT equality.