NORFOLK, Va. (WVEC) -- A sailor accused of sending naked pictures to a Homeland Security/Immigration and Customs Enforcement agent said he is not guilty of the crimes with which investigators charged him.

Scott Lee Penny, 31, entered the plea in federal court Wednesday. He also requested a jury trial which is slated for August 29.

Naval Criminal Investigative Service picked up Penny earlier this year.

Court documents state that Penny and the Homeland Security/Immigration and Customs Enforcement agent, who was working in an undercover capacity in Laredo, Tx., began communicating with each other in March. Investigators said Penny used the screen name "Mike Smith" to contact the undercover agent on the social networking app KIK. The KIK account, itself, was named "girthforu69."

The same documents list an explicit exchange between Smith, later identified as Penny, and the agent. In much of the conversation, Penny discusses performing sexual acts on himself and the "13-year-old."

Investigators traced Penny's KIK account to several IP addresses including one in his wife's name at their home in Virginia Beach.

Penny's attorney told 13News Now it will be a tough fight for them in court, but he's hoping that Penny's clean record will help his case.