which has a different culture than the West.
Living with their parents may be a benefit for arranged marriages. Now they are moving out, arranged marriages maybe are dropping, but they don't have the culture to make non-arranged marriages (all the above is of course just assumption)
Now in many Western cultures there is not any sort of arranged marriage etiquette, you live on your own and you invite people over for sex, a person who lives at home is categorized as a loser. I can certainly see why living at home in one of these cultures would end up not providing the necessary ingredients for marriage to be on the roadmap.
Aside from all this I suppose access to birth control takes away the whole got in trouble, need to get married aspect of the past.