Of course, there are. The question though is whether there is enough of a correlation with third variables to lead one to believe 'possessing iphone' = 'possessing more sex partners' is likely not causal? As GP and other commenters point out, there are enough.
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Of course, there are. The question though is whether there is enough of a correlation with third variables to lead one to believe 'possessing iphone' = 'possessing more sex partners' is likely not causal? As GP and other commenters point out, there are enough.