you know it wasn't so long ago that two men kissing would have been arrested in the UK. A friend of mine and his partner were arrested for doing just that back in 1989 and though in recent years the police bothered less and less about it, the law making it illegal was only repealed in 2003. Two blokes were arrested just last year for kissing in front of the Colloseum in Rome.
I just highlight that because different societies inevitably have differing laws about what is considered obscene in a public space. It does not mean it will always be so and individuals within the society concerned will no doubt be pushing the boundaries and seeking change. However, it makes no sense at all for tourists to break the laws and get imprisoned or fined for it as that just confirms the view of the locals that sexual perversion is a foreign import.