Because they are whores. They crave for cum. They need more sex than Sinhala girls as a fact. Sinhalese live under a lot of pressure due to this economic bullshit situation we are facing while Muslims do drug business and illegal imports, and millions of bad businesses just to keep their race going, which is totally approved by your religious book Quran.
They use their own Muslim network connections in overseas, and also churches collect funds and spend them on poor Muslims so basically they don't live under a lot of stress. They are terrorists. Strategically tries to take the power of weaker countries and all over the world. So it's obvious, Muslim girls don't get much attention that they need. It's a side effect of your broken system. We don't do much harm but use their holes set to dump our cum load. No hard feelings. They are sexually more active than Sinhala girls. Because they have less problems to look after. Most of them eat super foods which make them feel even Hornier.
It's just the nature rules. In your case, it's the Allah's wish. I'm not being racist here. Whores just need sex.
I have muslim friends too. Also Muslim girls who need extream sex. (just two girls that I personally know, but I know what exactly the majority want. So easy to fool them bro. They just need some decent looking guy to have a good sex. I call them cum dumpsters)