Oral sex or vagina dentata?
This is completely unshopped - sorry if that means it's against the compo rules.
It's a genuine sign near the entrance to the Central outpatients' department at the University Hospital of North Staffordshire in Stoke-on-Trent.

From the
Making Hospitals Dangerous challenge. See all
239 entries (closed)
(
Snappyuk gets BIGGER with free sample.,
Sun 28 Feb 2010, 14:19,
archived)
grim
(
Citizen Cavy Admires your passion for conformity,
Sun 28 Feb 2010, 14:20,
archived)
Om nom nom nyom.
(
witty_ditty has made multiple miaows since,
Sun 28 Feb 2010, 14:20,
archived)
the first phrase that comes to mind is
now there's a fanny you can get your teeth into
(
Smash Monkey lowering the tone of the whole internet,
Sun 28 Feb 2010, 14:21,
archived)
Nibbles gently
licks vigorously.
(
FeralCatMan Unusual disease collector.,
Sun 28 Feb 2010, 15:00,
archived)
ed: losing battle
(
Letum Your Ad here £2.40,
Sun 28 Feb 2010, 14:24,
archived)
ah, staffordshire
that bastion of safety
(
CowJam,
Sun 28 Feb 2010, 18:11,
archived)