On "Strange Sex" (Sun., 10 p.m. ET on TLC) viewers met Mark, who has a rather unusual -- and time-consuming -- sexual fetish: smelling women's shoes, the stinkier the better.
In fact, Mark estimates he spends around 40 percent of his day smelling shoes, which he obtains from female friends.
So, what does Mark look for in a shoe? "The ideal pair would be really worn or a couple years old," he said. "What I like the most is a real sweat smell."
"Strange Sex" continues on Sundays at 10 p.m. ET on TLC.
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