He is donating proceeds from the sale of autographed copies of the magazine to local gay charities.
Kroell described the shoot -- in which he was photographed by Lope Navo -- as "nerve-wracking."
However he added that his stint on Make Me a Supermodel helped since he was "naked all the time" during filming for the Bravo reality series.
"But that was censored," he told E! News.
Kroell finished as the runner-up to Holly Kiser during Make Me a Supermodel's 2008 first season. He is currently dating actor Taylor Proffitt.
"Taylor loves the photos," Kroell told E! News. "He helped in areas that mattered the most during the 40-degree day of the shoot -- if you know what I mean."
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