Nearly four years after Los Angeles County passed new requirements for pornographic performers, the porn industry has spread to nearby counties like Ventura County — and much of that filming is happening in residents' homes with or without their knowledge, the NBC4 I-Team has learned.

Private citizens believe their home is being rented out for a few days — perhaps never knowing it's become the set of a raunchy pornographic title.

An enema kit, bottle of lubricant and a business card are among the things Kristina Knapic said she discovered after renting her house out on the online rental service Airbnb.

Doing a bit of research, she learned the person who rented the house was Michael Lucas, an adult performer and producer, and owner of Lucas Entertainment.