There's an inconspicuous metal box mounted on the wall of the gym at San Francisco County Jail No. 4.
When Kate Monico Klein turns a knob, the machine releases a condom in a small cardboard packet. Machines like this one — dispensing free condoms — are installed in all of the county's male jails.
"We set [the machine] off to the side, so that people would have a minor amount of privacy," explains Monico Klein, director of HIV services for Jail Health, a division of the county's health department.