Is it forbidden in Thai/Buddhist religion for a woman to perform consensual oral sex on someone?

Is it forbidden in Thailand and Buddhist religion for a Thai adult female living in the western world to perform consensual oral sex on someone?

I don't know that about in Thailand, but In Buddhism nothing is forbidden unless you observe Sila, it may be Five, Eight, Ten and willing to protect at all cost.

Simply you can do whatever you want, but the consequences for things we do were perfectly clarified and told by Lord Buddha. We need to think twice before we do something.

In this case, no matter where she live, whether she have observed Pancha Sila or not, if she isn't with her lawful husband, she broke one of five percepts which causes to very cruel consequences in this life and next afterlife.

In all restricted Theravada culture...

As Arahanta Anagami and monks, all sex is for fun with 5 strings. The Buddha taught detach from 5 strings, so it is forbidden for Arahanta Anagami and monks.

However, as Sotapanna and ordinary, who being not monks, the Buddha taught to re-understand misunderstood first, so moral sex, which being harder to detach, is not forbidden for Sotapanna and ordinary.

Sotapanna and Sakadagami, who being not monks, are trying to avoid sex, in processing, so sex is not forbidden for them.

Is it forbidden in Thailand and Buddhist religion for a Thai adult female living in the western world to perform consensual oral sex on someone?

"Consensual" is not enough. The relationship needs to be a committed and legit. one. Adulterers "consensually" engage in sexual relationship, but that still absolutely violate the 3rd Precept. So, assuming the relationship is legit., and folks haven't reached any stage of the Noble Fruits, what and how couples conduct their "business" is their own business (obviously assuming they "do" it in their own private room). However, since Buddhism always encourages working toward higher more refined states of mind and eliminating grosser form of pleasures, certain forms of sex acts are considered cruder than the other (ie. it'd require a lot more clinging/attachment/desires to use the mouth on someone's excretory organ versus just letting the 2 excretory organs "do their work", etc.), a good Buddhist would be mindful and strive toward more and more wholesome alternatives, as taught by the Buddha in AN 8.53

The Buddhist path is followed by those who voluntarily choose to, i.e., by those who take refuge.

Dhammapada 242 says: "misconduct is the taint in a woman" (malitthiyā duccaritaṃ). Traditionally, in Thailand, monks interpreted this to mean the only allowable sexual partner for a Buddhist woman is her husband. In traditional Thai culture, the sexual purity of a woman & a mother was considered very important. Thus, while the mother remained sexually moral, often it was acceptable for men to occasionally have sex with those women who were outcastes from mainstream society, namely, prostitutes. (Yes - this appears to be a typical characteristic Thai "double standard").

Also, the idea of "consent" has no relevance to the Buddhist path because a "consensual action" may still be an unskillful action that brings harm & suffering. For example, many people consent to have uncommitted sex with eachother yet often such sexual interactions bring suffering, such as anger, blame, addiction, regret, feeling used or heartbreak. The emotional reactions of lonely desperate people (called "hungry ghosts" in Buddhism) searching for sex is often unpredictable. Often people that engage in promiscuous sex have hidden psychological issues.

All religions, including Buddhism, include sex in their moral guidelines because sex is not 100% pleasure and can bring suffering. The Buddha said about sexual pleasures: "They bring little enjoyment and much suffering and disappointment. The perils in them are greater". For example, some individuals even commit suicide due to the loss of a lover. Many men angrily lose their financial wealth when their wife revengefully divorces them. When promiscuous women "hit the wall" due to age & menopause, they often appear susceptible to depression.

Therefore, to attempt to answer this very broad question:

1. If a Thai adult female living in the western world is a Buddhist that has taken refuge in Buddhism by voluntarily choosing to observe the five precepts; then to perform consensual oral sex on someone apart from her husband or her (same sex) wife would be sexual misconduct.

2. Regardless, random acts of performing consensual oral sex outside of committed relationships leads to 'rebirth' in the hungry ghost (addiction), animal (shamelessness) & hell (suffering) realms. It is quite obvious the significant amount Western women over 40 years of age using antidepressants is probably largely due to their former sexual promiscuity & broken relationships.

Note: Most Thai people consider themselves to be "Buddhist", even if they have not taken formal vows (refuge) and even if they do not live a moral life. Therefore, if a Thai woman performs oral sex on many different people, she may still consider herself to be a "Buddhist". Even Thai prostitutes may consider themselves to be Buddhists. When I lived in a monastery in Thailand, a renowned corrupt politician ordained as a monk after he was stood down from parliament & lived in the hut next door to me. Therefore, we should be careful not accuse a Thai of not being a (cultural) Buddhist if they do not follow the Buddhist moral precepts.