HK is a dangerous place for freshly-arrived from overseas couples.
Were you married before you came to HK? If so, you will need uber-discipline to control yourself, because there are temptations everywhere, bars/clubs, gyms, work, business trips, networking business functions, etc.
Plus this is the most important thing I will advise you, if your wife is beautiful and still looks good for her age,
you will have to worry about her too not just worry about yourself.
I have seen many couples (dating/married) break-up because the gf/wife wants to leave the relationship, not the guy, and pursue a new relationship with that rich guy who is pursuing her. Many of these girls really fall hard for that lifestyles of the rich and famous when a rich and powerful guy is pursuing her. It is so addicting for freshly arrived girls to experience mingling among the elite and be treated as one too by the common folks that they don't mind the guy is much older. Many of these rich guys don't care that the girl is in a current relationship as they believe anyone can be bought.
Now you wonder how do some couples survive in HK? Well, it goes like this, if the couple met in HK, there may have been a good chance the girl had already dated a relatively rich or successful guy in the past and was turned off by the whole experience because the guy was never around to do the normal dating stuff that all girls crave and enjoy or treated her like shit (or like a HG/mistress) because he could with his power and money.
In conclusion, if you feel the temptations for extracurriculear activities, wait until you are on a biz trip and do it outside of HK. Don't stay away from HK and the home too often and too long as the wifey may get bored and tempted herself too. If you have to do it in HK, make sure you make it home everyday for the evening meals so at least you two can mutually check on each other.