A sign showing the way to the prostitutes' stands is seen during an open day at a sex drive-in, west of Zurich, Switzerland. Photos: Reuters : Sex on the menu at new Swiss drive-thru

People visit one of the so-called 'sex boxes' during a tour the open day. : Sex on the menu at new Swiss drive-thru

A man looks at a sign explaining the rules of the sex drive-in. : Sex on the menu at new Swiss drive-thru