I think it correlates more strongly to the prevalence of pornography. Mainstream movie scenes look fake and contrived, because they are. As unrealistic as pornography is, that is actually a dick, and it is actually going in a vagina.
When your mainstream movie sex scene is going to be compared (unfavorably) to a scene of two people actually fucking, why bother even shooting it?
I think it correlates more strongly to the prevalence of pornography. Mainstream movie scenes look fake and contrived, because they are. As unrealistic as pornography is, that is actually a dick, and it is actually going in a vagina.
When your mainstream movie sex scene is going to be compared (unfavorably) to a scene of two people actually fucking, why bother even shooting it?