Imagine you're in a loving relationship with a man who you think is committed to you. You would probably never think he would have an affair with another woman...let alone promiscuous sex with other men, but that's exactly what some say men who are living on the "down low" are doing.

This behavior isn't just harmful to a relationship; it can also be life-threatening to you and your partner. In 2004, AIDS was a leading cause of death for African-Americans ages 25 to 44. "That is starling," Oprah says. "All of my alarms went off." Women, college students and people over the age of 50 are at greater risk than ever before, and as Oprah discovers, men living on the down low may be one reason why.

Watch these three men speak out about living double lives. Watch

One man sets the record straight about this secret lifestyle and explains how his sexual desires destroyed his family.

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