Michael Douglas might be a straight, married man in Hollywood, but he got a glimpse at life as a famous, closeted gay star while playing Liberace in the HBO biopic, "Behind the Candelabra."

Although times have changed since Liberace's day, Douglas knows some celebrities continue to stay closeted in order to "protect" their careers.

"It’s a much smaller minority of people who think they still have to stay in the closet," Douglas told the United Kingdom's ShortList magazine about gay celebrities today. "It’s quite interesting to see how fast it’s all changed."

"Without naming names, I certainly think there are a couple of people out there who have not come out in the spirit of protecting their careers and livelihoods," he added. "It’s probably a little bit more difficult going that way. I think that’s true."

Douglas certainly knows a bit about the business side of things,...