Nice one bro donaldduck!
I have one experience to share too. Its not exactly fucking in public area, but its fucking for others to see.
It did not happened in Singapore, but in France. My gf and i were staying on the 3rd storey in a relatively good hotel in Paris. It was in the evening and i had a mischevious idea for her. I switched off all lights in the room, drew open the curtains and stripped her naked. She was blind folded and i pushed her against the window and doggied her for a good 10 min theres.
I remembered vividly that there was a gym directly across us and 1 guy was running on the threadmill. I was not sure if he saw us or not but it was really one hell of a time we had there. When the small head rules over the big head, anything goes.
It was after this incident that i came across a short clip in the net in which a couple (not us) was caught in action doing the same thing by a newscaster so something like that. I showed my gf that clip and she swored to "kacha" me if she finds herself appearing in the net one day.
