Why is cohabitation and hooking-up culture also spreading in South America and other countries?

I'm from Peru and even here, less people are interested in the traditional lifestyle of marriage and kids.

It isn't just in the USA nor UK but also in South American countries and other parts too. There have been several cases here of women staying in those long-term relationships (even having kids), living together and waiting endless for a proposal they'll never get. Too many people are also just into about pleasure and nothing else. People are also getting westernized here and it's out of control. Why?
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A couple members in my family are doing that. It's really disappointing to be honest. Meanwhile I'm still living with my family. I've never lived with a boyfriend. My current boyfriend knows I want to do things the old way; if I live together then it's to get married and have my first child.
Why is cohabitation and hooking-up culture also spreading in South America and other countries?
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