A major motion picture opens today across the country about an athlete breaking through the barriers of discrimination and using sports to spearhead changes throughout society.

"42" is the story of Jackie Robinson, who in 1947 became the first black player to swing a bat in Major League Baseball.

The timing of this movie is fortuitous, because it reminds us that 66 years later the barriers of discrimination still stand in professional sports.

Not for blacks, so much, or for Latinos or Asians – all of whom fill roster spots throughout the Major Leagues. Ethnicity, once a firm line that couldn't be crossed in baseball and other major pro sports, isn't the issue any more.

Sexual preference has become the next frontier.

A story on today's Page 1 from the New York Times says the National Hockey League has declared it will fully support any player who decides to reveal his homosexuality, and the league also will institute training and counseling programs on gay issues for its teams and players.

This is Page 1 news because no athlete has ever revealed his homosexuality while playing for a professional American hockey, football, basketball or baseball team. Some have come out after retiring, but not a single one has been willing to publically acknowledge his sexual preference while still sharing a locker room with his teammates.

The professional sports locker room is "the last closet in America and one of the most important ones," Brian Ellner, of the gay-athlete support group Athlete Ally, told the Times.

And that's about to change. Those who would like to break down this last barrier have talked recently of a group of gay athletes – perhaps four or more and from more than one major pro sport – who are talking about coming out together as a way to deflect the spotlight from the "first" openly gay player of one of America's favorite manly sports.

Which brings us back to Robinson, whose number 42 has been retired by every Major League team in honor of the personal sacrifice and athletic prowess he gave to the sport. In 1947, he was the first and only black player at a time when Jim Crow laws and racial injustice were woven tightly into the fabric of America. He suffered physical attacks on the field, invective from his own teammates and shameful displays of hatred from fans who wanted to keep the game white. He responded with external stoicism and an internal fire that made him the most exciting player of his time, and a shining light for every person – atheletic or not – who has faced discrimination since.

Robinson's story is inspirational; I can't wait to see the movie. But there's no reason for a "gay Jackie Robinson" today. Gay athletes already are playing at the top levels of every sport, insiders say, and no single athlete needs to become the target of the slings and arrows that may accompany his coming out of the closet.

But where will those slings and arrows come from? In Sports Illustrated this week, columnist Phil Taylor suggests a revelation of homosexuality probably won't elicit much more than a yawn in most locker rooms. After all, he says, professional athletes care most about what a teammate does on the field – not what he does in his bedroom (despite what San Francisco 49ers designated idiot Chris Culliver said – and later apologized for – during the leadup to this year's Super Bowl).

If there is any backlash, it will be among sports fans – particularly men. If you're a Baby Boomer or older, like me, you probably were brought up in a culture that taught us that "real men" excelled at sports, and the rest pursued other interests such as literature and arts and gardening. To find out that your favorite gap-toothed defenseman with the 100-mph slap shot and proclivity for center-ice fistfights is a gay man might just turn your idea of "real manhood" completely upside down.

Which, if you think about it, is the point of all of this. After all, it was only 66 years ago that a lot of Americans knew it was absolutely wrong to mix blacks and whites on a baseball field.

If Jackie Robinson taught us anything, it's this: Don't believe everything you know.

Chris Coursey's blog offers a community commentary and forum, from issues of the day to the ingredients of life in Sonoma County.