My 2 cents:
The visitors will most likely be confined to and skew the market in Wanchai at the various girly bars and free lancer joints.
Those of you who, like me, partake in 141s and brothels in Kowloon will probably not be affected.
Most of the sailors and the marines accompanying them are not so adventurous and have limited language skills and will not venture into local places, although I understand are some ABCs on board who may do so if they have the language skills.
In addition there are frequently places which are designated "off limits" like saunas, and any prudent sailor will not break the rules.
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