Jon Hamm admits working on porn movies was ''soul-crushing''.

The 'Mad Men' actor was a set-dresser on softcore adult movies in the late 1990s and says it was one of the worst jobs he'd ever had.

Discussing a recently resurfaced episode of 'The Big Date', which he appeared on in 1996, he said: ''I was actually at that time working as a set dresser for Cinemax soft-core-porn movies. It was soul-crushing.''

Jon's career has come on massively in recent years and he doesn't think he'll ever get a better job than playing advertising boss Don Draper in 'Mad Men', which will come to an end after its current seventh season.

Speaking to the new issue of Vanity Fair magazine, he said: ''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.''

Jon is also heavily involved with the plotlines of the drama, with show creator Matthew Weiner admitting he knows ''everything'' that is going to happen and the writers often go to the actor for suggestions when they get ''stuck''.

Matthew said: ''He knows everything. He's the first, outside the writers' room. I try stuff out on him.

''When we get stuck in the writers' room, I go down there and have a conversation with him.''