>>12489868Xenophilia. If they're weebs, they've already got it to some degree, but porn is easier. Like a different culture, it's different and exotic, but unlike culture, it's exceptionally easy to understand with a low ceiling, and doesn't require weeks or months of learning another language and so on to grasp.
As for why xenophilia exists on a sexual level, along with the common social practice of exogamy which encourages it to varying degrees, an individual that prefers to lean towards heterosis is perfectly common. It's part of why (maybe) a solid part of mutual sexual attractiveness is apparently having the individual immune systems be as different as possible.