There's nothing San Franciscans love more than sanctifying bicycles and celebrating our sexual enlightenment.  Now you can do both!

So what is “Bike Smut” exactly?  Here's a couple of handy, shockingly safe-for-work GIFs to help paint the picture:

You can browse around their tumblr for more bisexual bicycle intercourse that may or may not get you fired from your job, or just hold out for Saturday's screening (and keep your fingers crossed for some bizarre rear triangle scissoring).