Ok, first you choose a former porn whore who has found God and become an outspoken critic of the industry. Posing as legitimate journalists, you interview her, her family and members of her church. You ask probing questions about the things that she did, how it affected her relationship with God, how she feels about the industry now, etc. Try to provoke her into saying the most outrageous things possible, but without being too outlandish as you don't want to give the game away. Unbeknownst to her, you have already bought up the rights to the best scenes of her previous career.

Once you have enough footage, you edit things together to create a montage of interview footage interspersed with shots of her getting ass-fucked, gang-banged etc. Try to create as much of a contrast as possible, eg splice segments where she says how she never enjoyed her work with porn segments where she is saying "oh yes, fuck my ass" etc. You get the idea.

Release the resulting work with a title like "Sanctimonius Slut", "Holy whore", "Born again bitch" etc. It'll sell by the truckload, I guarantee it.