"Robert Winn met his wife, Christine, in college. Early in their relationship, he made a confession, a thorny secret he camouflaged from his closest family and friends. He told her he was bisexual."

Stephanie Chen reports:

On the surface, Robert Winn, now 40, and Christine Winn, 41, appear to be like any other blissfully married heterosexual couple. They boast nearly 18 years of monogamous marriage. He's a well-respected physician, who works with the LGBT community in Philadelphia, Pennsylvania. She's a successful hospital administrator.

The couple says they've grown closer over time, but like any marriage, two people can have differences -- including sexual orientation. Christine Winn is straight, and she has been supportive of her husband, who is openly bisexual.

He frequently battles the stereotypes of bisexuality: That bisexual men are promiscuous. That his relationships with men were just an adolescent phase. That his bisexuality is imaginary. That he's really a gay man trying to camouflage his orientation.

About 1.8 percent of men and women between the ages of 15 and 44 identified themselves as bisexual, according to a 2005 survey from the Centers for Disease Control and Prevention. READ MORE