I've read on the news that this is common in alot of middle eastern cultures. And in parts of Africa, I believe. It's some ancient practice thats done, so when a woman gets older and married, she won't cheat on her husband. Because she dosent desire sex.
It's very controversial. The rest of the world thinks it's a practice that should have died out 100 years ago. But I read some place. It's done to something like 80% of the women in the world. So, I guess its more "popular" than we think. But I only know what I read on the news. So if its totally true. I don't know.