I lost my virginity in my parents living room, with my mum & dad in their room less than 50 feet away with the door open.
Other than that probably the dumbest place I had sex would be at my other workplace, once in the back with the wine & I gave the same person a blowjob in the fermenting room with the beer

He wanted to eat me out in the cooler in the dark but I am not fond of the cold... lol