People with second homes, vacation properties(think cabin), and time shares will do this with whatever they aren't using. Often, it comes with taking care of pet fish, reptiles, birds, or even dogs/cats that don't like the other property, are incontinet, or aren't allowed there for whatever reason.
Speculators/Investors will avoid this however they can. They deserve all the squatters, and squatters deserve homes. Very very few people choose squatting over more conventional options; Even they aren't the villains of this story.
~~Left side is missing some context, and the whole thing could do with a title. Not every skilled professional is looking to get laid, and plenty of skilled professionals are women or gay men themselves.~~
Is there some concern with countries prohibitting travel to El Salvador? ~~or was your statement entirely in regards to gender ratios among Spanish-speaking countries~~ ?
EDIT: that's enough upvotes. I merely failed to zoom in far enough, although I still disagree regarding the graph's applicability to this Post.