Thai Buddhist marriage ceremonies are generally divided into two parts: a Buddhist component, which includes the recitation of prayers and the offering of food and other gifts to monks and images of the Buddha, and a non-Buddhist component rooted in folk traditions, which centers on the couple's families.
In former times, it was unknown for Buddhist monks to be present at any stage of the marriage ceremony itself. As monks were required to attend to the dead during funerals, their presence at a marriage (which was associated with fertility, and intended to produce children) was considered a bad omen. A couple would seek a blessing from their local temple before or after being married, and might consult a monk for astrological advice in setting an auspicious date for the wedding. The non-Buddhist portions of the wedding would take place away from the temple, and would often take place on a separate day.
In modern times, these prohibitions have been significantly relaxed. It is not uncommon for a visit to a temple to be made on the same day as the non-Buddhist portions of a wedding, or even for the wedding to take place within the temple. While a division is still commonly observed between the "religious" and "secular" portions of a wedding service, it may be as simple as the monks present for the Buddhist ceremony departing to take lunch once their role is complete.
During the Buddhist component of the wedding service, the couple first bow before the image of the Buddha. They then recite certain basic Buddhist prayers or chants (typically including taking the Three Refuges and the Five Precepts), and light incense and candles before the image. The parents of the couple may then be called upon to "connect" them, by placing upon the heads of the bride and groom twin loops of string or thread that link the couple together. The couple may then make offerings of food, flowers, and medicine to the monks present. Cash gifts (usually placed in an envelope) may also be presented to the temple at this time.
The monks may then unwind a small length of thread that is held between the hands of the assembled monks. They begin a series of recitations of Pali scriptures intended to bring merit and blessings to the new couple. The string terminates with the lead monk, who may connect it to a container of water that will be "sanctified" for the ceremony. Merit is said to travel through the string and be conveyed to the water. A similar arrangement is used to transfer merit to the dead at a funeral, further evidence of the weakening of the taboo on mixing funerary imagery and trappings with marriage ceremonies. Blessed water may be mixed with wax drippings from a candle lit before the Buddha image and other unguents and herbs to create a paste that is then applied to the foreheads of the bride and groom to create a small dot, similar to the marking made with red ochre on Hindu devotees. The bride's mark is created with the butt end of the candle rather than the monk's thumb, in keeping with the Vinaya prohibition against touching women.
The highest-ranking monk present may elect to say a few words to the couple, offering advice or encouragement. The couple may then make offerings of food to the monks, at which point the Buddhist portion of the ceremony is concluded.
The Thai dowry system is known as the sin sodt (Thai: สินสอด). Traditionally, the groom will be expected to pay a sum of money to the family, to compensate them and to demonstrate that the groom is financially capable of taking care of their daughter. Sometimes, this sum is purely symbolic, and will be returned to the bride and groom after the wedding has taken place.
The religious component of marriage ceremonies between Thai Muslims are markedly different from that described above. The Imam of the local mosque, the groom, the father of the bride, men in the immediate family, and important men in the community sit in a circle during the ceremony, conducted by the Imam. All the women, including the bride, sit in a separate room and do not have any direct participation in the ceremony. The secular component of the ceremony, however, is often nearly identical to the secular part of Thai Buddhist wedding ceremonies. The only notable difference here is the type of meat served to guests (goat and/or beef instead of pork). Thai Muslims frequently, though not always, also follow the conventions of the Thai dowry system.