did it at fort canning park twice, quite "crowded" with couples and hard to find a good empty spot with dim lights though, and beware of ants crawling on ur body
cars i guess it's common? there was once at the yishun stadium carpark and was told that a bangla was wanking while watching us bonking, quite funny though but i can't see coz i removed my specs
recently did twice at hdb staircase in the day
super ganjiong haha