Just one more celebrity sex tape PR scam.

from www.tmz.com – Karissa Shannon may have had a change of heart when it comes to fighting the release of her sex tape — and it all comes down to her suspicious visit yesterday to Vivid Entertainment’s headquarters.

Karissa and actor Sam Jones III — her boyfriend/sex tape partner — were spotted outside of Vivid’s office in L.A. yesterday afternoon … where Sam confirmed they just had a meeting with Vivid boss Steve Hirsch.

As for what the meeting was about — Sam told our cameraman they were “exploring all of our options” … then quickly covered his bases by saying, “Especially our legal options.”