When a 42-year-old registered sex offender answered the door naked and acting nervous during a surprise check by cops, the officers acted on suspicion and searched his home.

What they found next was a 15-year-old girl in Robert Gomez's bed, according to MyFoxTampaBay.com.

Click here to read the report from MyFoxTampaBay.com, which includes a photo of Gomez.

The girl cooperated, telling cops she met Gomez in an online chat room seven months ago, and that a sexual relationship began immediately.

Gomez was arrested and booked on one count of lewd and lascivious battery and a probation violation.

Already a registered a sex offender, Gomez was convicted in June 2002 on a lewd and lascivious assault charge on a victim under the age of 16.

He is being held on $7,500 bond for the second-degree felony.

Click here to read the report from MyFoxTampaBay.com, which includes a photo of Gomez.