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Five short years after swearing she'd never do porn again, Jenna Jameson is back getting naked on camera for money -- and she tells TMZ, it's all for the sake of her family.

Jenna recently made her return to the adult industry as a webcam model -- stripping and doing sex acts online in exchange for tips -- and she says her kids are a HUGE motivating factor behind locking down a steady paycheck.

As we reported, Jenna's been having money issues. She recently lost her Hollywood Hills home to foreclosure.