Written agreements for relationships are becoming common in many countries, and have legal force in some times and places.

What is the practice in Thailand? Can a written agreement protect the interests of both parties? Is it useful for mutual understanding? Can it be registered and enforced in case of a dispute?

I'm on the brink of making an arrangement for an ltr with a much younger person who I'll be supporting. I want to let her know I'm sincere while at the same time providing protection for myself if things don't work out.

Really interested in any information or experience about this.

As far as I know, pre-nuptial agreements are enforceable in Thailand. See no reason why any other reasonable contract meeting all contractual guidelines would not also be.

Suggest you consult Sunbelt Asia for thier imput, they are competent and reasonably priced.