WATCH: Are Lesbian and Straight Girl Orgasms Created Equal?

A recent study showed that out of lesbian, bisexual, and straight women, lesbians orgasmed 75% of the time. Straight women came (pun intented) in second at 62% and bisexual women at a mere 58%. I tend to think it's not so much about men, but about women. Women are often ashamed at speaking out loud and giving directions. Why do you think the numbers vary?