LOL, you don't know anything about Thailand, ROTFLOL.
What most Western social conservatives don't know, is that Thailand does not have a tradition of two-parent families, or even an idea of two-genders.
Traditionally, and what's still adhered to in the rural parts of the country, marriages (and fidelity) aren't that important. Your own extended family is the most important, and family is matrilineal with the exception of those minorities with Chinese or Tibetan heritage. Love and marriage are not romantic. The husband most often goes to live with the wife's and her several generations of her family; while her priorities are in the order of most to least important: her family, herself, her children, and then her husband and his family. When the couple does leave the wife's parental home, it's often to a piece of land that is in the immediate vicinity. Today that tradition is still a very strong influence even in the urban, cosmopolitan areas of Thailand, but there's more flexibility of which family the couple chooses to live with.
Next up, gender is fluid and there's more than two-genders. There's three-genders (phet-thi-sam) and four different sexualities. The Thai do not even bat an eye at kathoey, or sao praphet song.
Finally in the patrilinial spheres of Thailand (the Chinese/Tibetan/Burma heritages), polygamy is widely practiced. The second wife is called Mia Noi (or Pua Noi for polyandry). The practice was only banned in 2010, which means that it's still very common and still widely practiced.