Attempting to pay a “share” of the bill will embarrass your hosts.
Bear in mind that the consequence of a Westerner being caught with a prostitute may be unpleasant, and that AIDS is on the increase.
Restaurant bills are not shared out between the guests; instead, people will go to great lengths to pay the whole amount themselves.
Normally this honour will fall to the person perceived as the most senior, and as a foreigner dining with Chinese you should make some effort to stake your claim, though it is probable that someone else will grab the bill before you do.
Homosexuality is increasingly tolerated by the authorities and people in general, though public displays may get you in trouble outside the more cosmopolitan cities.
There are gay bars in most major cities, especially Beijing and Shanghai.
Women on their own visiting remote temples or sights need to be on their guard – don’t assume that all monks and caretakers have impeccable morals.