If you are thinking of meeting a girl or an escort from an agency like ours (MonaLiza) while you are visiting Asia, Singapore is the top choice for you.
First of all, the city state is well known for tight security and its strict laws on drugs usage. So if you are worried about engaging a girl who turns out to be a drug addict, this will not be the case in Singapore. Needless to say, only stick to local girls, as the foreigners may not abide the laws so closely. For instance, this is an article explaining why certain sites are not recommended at all due to the violation of local laws.
Second of all, it is an English speaking country. This means that if you come from Europe, Australia or United States, you will be able to easily find and communicate with any escort locally, as long as you pick a genuine Singaporean lady.
Third of all, SG is a small country. This means that you need not specifically travel to a particular part of the country to find good girls. It is almost exclusively outcall only, and the women will travel to your location to meet you at your convenience. This saves a lot of your time.