LAN Airlines, a "gay-friendly" airline that served as the official international airline for San Francisco Pride 2010, has a new ad campaign popping up at Muni stops all over San Francisco.

Hmm.

Do you think LAN -- who, we repeat, markets to San Francisco's LGBT community -- knows what "bareback" means, especially to certain folks in the Bay Area? Or didn't they know horse riding without a saddle is a dangerous problem affecting the gay community?

Full ad below.