Andrew Spark, 54, has been charged with soliciting prostitution and other counts after investigators received a tip that Mr Spark was canvassing women prisoners for sex in exchange for money.

According to police in Pinellas County, Florida, Mr Spark had sex with a 28-year-old inmate at least six times since June and filmed the encounters for an Internet porn series called Girls in Jail.

He is alleged to have paid the woman for sex over at least three years.

Mr Spark never represented the woman, but is alleged to have used his status as a local lawyer to gain access to the jail.

Detectives are now investigating whether he engaged in similar activities at other jails – and if the crime is documented online.