WHITEHALL, Wis. -

Firefighters at one department in west-central Wisconsin said they never imagined they'd be posing half-naked for a 2013 calendar.

But because the proceeds benefit Big Brothers Big Sisters of the 7 Rivers Region, several Trempealeau County firemen were willing to bare their chests.

Eleva fire Chief Brett Semingson said six or seven guys posed in front of a controlled burn over the summer. He says the models were apprehensive at first, but “once they got started it went a little wild.”

An Eau Claire Leader-Telegram report said 5,000 calendars have been printed. They went on sale Saturday for $15 apiece.

Photographer Cynthya Porter of Winona, Minn., said the photos are so tasteful that even the firefighters' wives are happy with them.

Porter also posted a video showing behind the scenes of the photo shoot on a YouTube channel for her business.