Thai boys who are "working" (bars or apps) don't care if you have sex with them or not as long as it doesn't effect their tip at the end of the night.
Non-working Thai boys enjoy dating just as much as guys in the West (with or without sex). If you're more interested in this type of arrangement try to meet boys well-away from the working scenes. If your using the apps I would suggest only contacting boys who list "looking for friends" in their profile, and leave out information about their penis size or sexual preferences. At least then you have a chance of meeting someone genuine who would enjoy dating you.
Now that I think about it, I can't think of even one single time in the past 20 years that I dated a Thai boy and didn't end up having sex with him that night - regardless of how the "date" was framed when we got together. But take what I just said with a grain of salt because my behavior in Thailand from day-one has been utterly disgusting...LOL