among other places
public swimming pool late at night (we climbed over the fence), airport bathroom, mall bathroom, stock room of bookstore, side of the highway, middle of a field of grass at a community college, cars parked various places, along nature trail at a local park, the back yard, bushes outside of my girlfriend's house in high school, trees along the sidewalk, rocks on the beach, farmer's field, jacuzzi, on the bench press bench in the gym at my apartment complex, behind some video equipment in the television production room in high school, back of a sex shop, stairwell at my girlfriend's dormitory, in a movie theater, Muir Woods, in a lake, massage parlor, soccer field, Disney World
and... re: the OP.. how does the sofa and the bath tub count as public places? I've done both of those too and many others in non-public areas