The problem with this map is that it's really just a tourist map that isn't really useful or accurate. If you have some money and hang out in tourist traps and you stand out as a foreigner, it's easy to get laid everywhere. It doesn't matter where you go and the map is pointless. It's mostly because:
Income disparity - Girls are just as easy in every country if you make 30x what the local girl makes. But if you go to these poor countries and actually meet a non-farmer girl who makes the same money as you, all the sudden these girls don't seem that easy.
'white-guy hunters' - If you go to some tourist dives, you will find the small self-selecting group of local women who are really into you for various reasons. But this rarely holds true for the average girl in that country. So you have these Asian/Latino/Black girls who seem to have one white boyfriend after another after another in a country where there are hardly any white people. It's not that white guys have an easy time scoring local girls, as much as it is that the same small group of ho's sleep with all the white guys.
hot or not - most white guys go to Asia/South America/Africa and they can't even tell if a woman is 18 or 30. As long as she is not fat, they can barely tell who is attractive and who is not. So they end up with the local 3/10 thinking that they just scored an 8/10. It's the same way that some African guys who are in the USA hook up with some fat ugly white woman and think they scored something special.
The longer you stay in some country, the easier it is to recognize the above 3 phenomena.
In summary, if you have trouble getting laid in any country, you just need to go to the local tourist traps and keep your fingers crossed that you can't tell apart a local 3/10 from an 8/10.
BTW, I got laid in Zimbabwe for real. Sick brag, yeah?