Our horniest times were when my girlfriend (now wife) would visit my parent's home during summer break from college (she lived about 300 miles away). Therefore, I have fond memories of:
(a) the Alewife parking garage;
(b) a rear stairwell in the Faneuil Hall Market Place;
(c) the back row of the dolphin show at the Boston Aquarium (hands only); and
(d) the parking lot of the Amtrak station, windows up, and 100 degrees Fahrenheit bright sunlight.
Oh, and when I visited her in New Jersey, we added
(e) under the boardwalk
just because of the song.