SALEM, Ind. (WDRB) -- Sex on the first date ends with a volunteer firefighter charged with rape.Kelby Hash appeared in Washington County Circuit Court Thursday accused of forcing an 18-year-old woman into sex on Dec. 13, 2014.

Police say the assault occurred in the Posey Township station 2 firehouse where Hash served as a volunteer firefighter.

According to a probable cause affidavit, Hash told investigators the intercourse was consensual and agreed to a polygraph test. Court records say he failed the test after being asked if the victim said "no" to having sex with him.

Court records say Hash pinned the woman against a wall inside the firehouse, began kissing her and said he would take her home after he was done.

There is no known surveillance video from the firehouse and police say the woman waited a month to come forward.

Hash pleaded not guilty during his initial hearing Thursday. If convicted he faces 3 to 16 years in prison. The volunteer firefighter refused to speak to WDRB News after the hearing but his attorney is emphatic about Hash's innocence.

"It's just not true," said Bart Betteau," Hash's attorney. "It didn't happen. It wasn't a rape, and he's innocent of that. And we think we're going to be able to prove that. As to specific items of evidence, I'm not able to comment on those. We just know now that he's innocent."

Even though a lie detector test may have helped lead police to arrest Hash, it is not permitted in court if this case goes to trial.

Hash is out of jail and due back in court for a preliminary hearing on May 7.

Copyright 2015 WDRB News. All rights reserved.