This kind of crap science just annoys the hell out of me – what they have identified is a correlation. This says absolutely nothing about any kind of causal relationship between R-rated movies and early alcohol use.
The article quotes one researcher as saying "No one is suggesting that R-rated movies alone are the cause of early onset drinking but it’s certainly a factor". I would like to know what proof implies that “it’s certainly a factor”.
Again, statistical correlation does not imply a causal relationship!