Because TCKs adapt easily to cross cultural environments!
Chameleons change their colour to blend into their surroundings.
TCKs are individuals who have been raised globally/across cultures and have this remarkable ability to analyse their surroundings and adapt quickly, whether that is switching language, behaviour, clothes, cultural practices, etc.
In short, Third Culture Kids are masters in blending into the current scene: just like chameleons, which, of course, is ideal when it comes to cross cultural dating.
The major difference is that most are not massive fans of eating insects as a meal (although that’s changing).