"Mad Men" star Jon Hamm is on the cover of the June issue of Vanity Fair, but his interview revealing a difficult truth about his past is what's getting the most attention.

The actor spoke highly of his "Mad Men" character Don Draper and the series itself, which is ending after seven seasons.

"This is the best job I've ever had and maybe ever will have in my life-it's so fun to play all of this. It can be relentlessly dark. It can be terribly sexually inappropriate, is a way to say it. But who else gets a chance to do any of that stuff? There's so much there."

Hamm talked to the entertainment magazine about the lowest point in his career, which included a brief stint in the porn industry. The memories were brought up when an episode of "The Big Date" from 1996 resurfaced.

"I was actually at that time working as a set dresser for Cinemax soft-core-porn movies," he told Vanity Fair. "It was soul-crushing."

His brief career in porn was not the only detail about his past he revealed.  Hamm also talked to Vanity Fair about losing out on a girl to fellow actor Paul Rudd.  Rudd, who is friends with Hamm, explained the story to Vanity Fair.

"He seemed like he was a good-looking, athletic guy who possessed qualities I did not possess," Rudd told Vanity Fair.  "We were playing Trivial Pursuit in teams. Sarah and I were on one team and Jon and Preston were on the other team. Jon would want to go right to Yellow, which was History, and I was like, 'Oh, great, this guy is smart too.' They would ask a question like 'What is the largest lake in Africa?,' and Jon immediately went, 'Lake Victoria.' I felt so emasculated in the game that, as a result, I started reading atlases."