A Pennsylvania couple secretly videotaped a Catholic priest having sex with their 18-year-old daughter in the basement of their home and are now suing, saying he got her pregnant.

The lawsuit, filed on Thursday, alleges that the Reverend Luis A Bonilla Margarito carried on a sexual relationship with the teen while he was the chaplain of Reading Central Catholic High School and she was a senior there.

Rev. Luis A. Bonilla Margarito ... caught in the act. Credit:AP

The girl's parents became suspicious and installed a camera in their basement, where Bonilla and the teen were spending large amounts of time. The camera recorded the couple having sex in November 2009, after she had graduated, according to the suit.

Her parents took the video to the Diocese of Allentown, which removed Bonilla from his dual posts as chaplain and pastor of St Joseph Church in Reading after he acknowledged an "inappropriate relationship" with the teen, according to a diocesan news release.