Seeing as how a parklets are popping up around the city on pretty much a weekly basis, and massage parlors are a dime a dozen in the Tenderloin this was bound to happen eventually.
Spotted by local photographer The Tens, this parklet in front of Paradise Massage on Jones Street appears to be (ahem) serviced by the folks at the Nile Cafe and Hookah Lounge next door. Because the mini-parks are technically classified as public space, however, there's really not much anyone could do to prevent patrons from waiting for their happy endings at the bistro tables.
On the other hand, this might be one of the few cases where putting a public park space out in front actually hurts foot traffic to a nearby business. (The massage parlor, that is.)