The unofficial attitude taken by the authorities is that as long as nobody is hurt and it is a transaction between two consulting adults, then there is no problem. These are not just legends - it really does happen. Katoeys have become something of a tourist attraction. They take a very dim view of anyone caught having sex with an under age girl. It's an unsolicited waste of your time.
The age of consent in Thailand is
Naughty Nightlife in Phuket
The more refined Asian customers will go to the karaoke venues such as Pink Lady. Katathani Phuket Beach Resort 4. Most of these bars do have working girls but because they are on the street, they are less obvious about wrapping themselves around poles and pushing themselves on potential customers. Ten minutes walk to Bangla Road and 2-minutes to the beach. I don't know my dates.
I think the first thing you should do is ask where you should stay. HotelsCombined has created a great list of hotels located within a short distance from Bangla Road. For many visitors to Thailand, a visit to a go-go bar or sex show is on their must do list. Google gay patong and you will get more detail, but ask your questions here and there are a number of Phuket regulars that will answer. You shouldn't be too naive about the kind of girls you'll meet in Patong. They do not make enough money or they lose all they earn on drugs, gambling or supporting Thai boyfriends. This is the northeast of Thailand and is the agricultural heartland of the country.