Five young Bulgarians, four women and a teenage man, were arrested in a raid against three illegal pornographic studios.
The sites in Plovdiv provided explicit sex footage to a US website, the police say as cited by the media Saturday.
About 25 people were employed at the studios, and all of them were of legal age and working at their free will.
They received USD 0.60 - 0.75 for their Internet-delivered performances, according to reports.
Private Darik Radio says that the porn production was arranged by two Bulgarian men, whose illegal studios had already been raided by the authorities once.