Photos: Joggers show off their boxers, briefs and bras for the 2013 Cupid's Undie Run

If you're ever dying to know whether an acquaintance wears boxers or briefs, invite him to the Cupid's Undie Run. (Unless he's a coworker, in which case that might be weird.) But that's all you have to wear to the annual skivvies-friendly run through downtown Denver. To raise money for the Children's Tumor Foundation, the city's brave (and probably cold) relaunched their sexy fundraiser this weekend at Stoney's Bar & Grill. Continue reading for photos of the best-dressed (or maybe least-dressed) and visit our full slide show for more.

See also: - Slide show: the 2013 Cupid's Undie Run - Photos: The 2012 Cupid's Undie Run - The best-dressed primates at the 2012 Gorilla Run

For more photos, visit our full slide show.

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