In Singapore, prostitution is completely legal. However, there are some things that are banned, which include living off the wages of being a prostitute and soliciting on the streets. Brothels are also banned, but unofficially, police tend to monitor a limited number of brothels within their local area. They will do this to ensure that everything is running safely and that no kind of gang violence gets involved. Furthermore, all prostitutes in these places must go through constant medical checks to ensure that they are healthy, and that they are not passing on any kind of sexually transmitted diseases onto customers.
You will also find sex services on offer in many 'massage and spa' parlors. These parlors are found dotted across Singapore, and the owners of them face the risk of prison of they are ever caught. This is because it is illegal to offer these services behind the false claim of their brothel being a massage parlor. Telling the difference between a real parlor and a behind-the-scenes brothel is pretty easy, as most of the workers in the brothel 'parlor' will be dressed rather provocatively.