It was only a matter of time

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It was only a matter of time, but Amanda Knox has already gotten her first offer from a porn company -- but there's a HUGE twist ... because this deal offers CASH without having to show ASS. 

Vivid Entertainment honcho Steve Hirsch tells TMZ, "We would like to offer her the opportunity to be our vivid.com spokesperson and represent the studio at trade and retail events."

He adds, "This would involve no nudity or sex.  Of course we would welcome talking to her if she wants to pursue this direction, but the decision is totally hers to express."

So far, we're told Hirsch is still waiting for a response.