I agree Mat, but people in HK definitely at least talk about infidelity a lot more, for example most men in the UK would never openly talk about using prostitutes, here I hear men boost about it...
I've also had some ladies tell me that it is 'natural' for a man to eventually cheat on their partners, I'd never hear stuff like that in the UK, people are definitely more conditioned to see infidelity & prostitution as normal and maybe more acceptable here.