I'll read the article in a minute but tbh it wouldn't surprise me - I really had my eyes opened during the days I was doing NGO work and also with the subsequent discovery years later of what some of the people I was working with were up to. There was a lot of married men having a local 'girlfriend' - ie having regular sex with someone and treating their family differently to other families because they were having sex with them - more food, better living conditions etc. This meant of course that local women were desperate to get 'girlfriend' status. Even those who weren't quite so generous with their financial favours thought it par for the course to have a person to shag while they were away from their wives - they totally took advantage of the unequal financial status of the people we were supposedly supporting. And then, years later, it transpired that a couple of the men, doing supposedly humanitarian work, were having sex with refugee children. The whole thing is fucking sickening.
I think how it goes is that war zones and places where law and order has broken down attracts a certain amount of flotsam and jetsam, because there are no repercussions for behaviour that they would, quite rightly, not get away with in more 'developed' nations. Incidentally, for any of you thinking of donating to NGOs, the one honourable exception to any of this were the workers from MSF. But everyone else, from tiny charities run on a shoe-string to larger concerns, to govt employees, had a certain proportion of people who were, to be frank, acting like fucking dogs on heat.