1- The shopping mallAnyone who's ever worked at a mall knows about those rear walkways used to connect stores. The doors are usually open and no one's patrolling them most of the time. Just wait for the shoppers to look the other way and duck inside a "Mall Personnel Only" door. And because those back walkways are so quiet, it's easy to hear footsteps approaching.
2- Empty university classroomEver been bored in class and wondered what better use you could put that lecture hall to? Schools usually post a schedule of when each room is free and when it's in use. Just take note of an opportune time and show up. Universities being the trusting types, often these rooms remain open. Now if you can dodge the janitor, you're in. Don't forget to leave the lights off so as not to attract any attention.
3- The parkAh, a day at the park. Here a spot deep in the woods is probably no good because of poison ivy, deer ticks and an assortment of other hazardous plants and creatures. So find a hidden grassy spot somewhere out of sight.
You're best off heading there at sunset or at night, when there are less people, and choose a spot that has some kind of obstacle that you can hide behind long enough to pull up your pants, should you get caught.
4- On a downtown trainIf you find yourselves on a train for an hour or so, find an empty train car and get busy. Look for the cars with the bench seats -- plush upholstery is preferred. Just wait until the train is not too full and it's nearing the end of the line. Oftentimes if it's the last stop of the night, train conductors will make the remaining passengers move toward the front car, giving you your choice of empty cars.
5- CemeteryWhy not try the cemetery? You know it's deserted, peaceful and quiet. Usually the front gate is always open, but if not, it should still be relatively easy to get in. The most you'll have to do is jump a fence. Just wait until after nightfall.
6- Golf courseThe golf course is another good choice for sex. The grass is manicured and soft. And because there aren't any twigs, branches or rocks laying around, you may not even need a blanket.
It's best to do it at a public golf course because country clubs are a little touchier about trespassing (unless you happen to be a member).
7- Coat check areaThis could be at a wedding, for example. People won't suspect you're gone, and even less that you're hiding in a closet. Just duck inside, quietly close the door (if there is one) and get down to business. Even if someone comes in to get their coat, if the room is somewhat big, they probably won't be wise to a thing.
Sometimes company parties are held at fancy catering spots or at country clubs. Both of these places likely have great unattended coat check rooms.