I'd take their picture and plaster it all over the internet.
What would you do if you bust a couple having sex in a park?
Nothing at all. No skin off my nose.
Mrs Didge and I were walking the dog one night. It's a leafy area and a car was pulled in, about 50 metres from the road. The young couple beside it had obviously just finished having it away and were standing beside the car, starting to get dressed.We both had a grin (been there, done that) and that would have been the end of it.
But the dog barked.
What happened next was comical. The girl ignored us and continued to get dressed. The boy, clad in nothing but, I imagine, a body-sized blush, dived into the car and hid.
Tell them to get a room.
I wouldn't do anything . I would just walk away and mind my own business.
Without disrupting them...saw like a movie (free of cost) and go away..they have rights to make use of the public place and i too have rights to make look on public place..ha ha ha