The 19-year-old diving star, who won a bronze medal at the 2012 London Olympics and went on to front U.K. reality Tv show Splash!, told his fans on Monday (02Dec13) that he was dating a man in a candid video posted on YouTube.com.
He kept his partner's identity a secret, but Britain's The Sun claims his mystery lover is Oscar winner Black, who wrote the screenplay for gay rights movie Milk and is 20 years older than the athlete.
A source tells the newspaper, "He's besotted with Dustin. They love each other and aren't concerned what anyone says about age difference.
"Dustin is very proud of Tom for making such a powerful statement about his sexuality - it's what he believes in doing. Dustin has given Tom the confidence to be himself. He's in awe of him and proud of him.
"He no longer minds people knowing they are together."