because those countries have high rates of births.when foreigners take their women,they already have a bunch of new women for them to take.
also, a lot of those countries are poor and a relationship is often kind of necessary for survival a lot of the times(or at least very beneficial), so betabuxing is way more common.here in the west no women needs to work,so betabuxxing happens way less since it's way less beneficial for a lot of women to do so.also in a lot of those countries welfare doesn't exist,which makes women even more desperate for men resources.
also a lot of the guys are occupied on the "grind",and worry more about survival and family(their families are often gigantic),so it's much less of a worry for them.they will just fap or go to a prostitue once if they can afford it. most guys here barely have a functioning relationship with their parents much less the rest of their small family(many of us have lost a lot of family too or have no family at this point), but poverty often makes families unite,so i can see why sea is often well known for having "warm" families.
eitherway,those are the biggest reasons i can think of.
yeah there is inceldom there too,but it's less pronounced.i doubt anywhere in sea you can find that half of young men haven't had a relationship with a women much less a kiss in over a year(if not ever)