What's with Cialis advertising?

I just realized Cialis uses the image of a couple sitting in bathtubs in an outdoor setting in all their ads. What are they trying to convey? Who would haul a couple of bathtubs to the beach, the forest, the edge of a cliff for seating? Is sitting in separate tubs considered sexy? I know from personal experience that sex in a single tub is a bad idea. What am I not understanding?