Sex should be a reducer of tensions and aggressive behavior.
Since my hippie times where the big good sexual transformation and a big fight for sexual freedom that was associated with pacifism and non-aggression as a way to stop violent Behaviors.
After this times business learned from the cousin of Freud that subliminal or explicit messages sexuality could be used to increase sales of products.
After this era sex was transformed into consumerism as a product that you can buy, use and throw away easily.
Nowadays Movies tend to play with the unconscius mind and create movies about sexual fetichisms, pedophilia, violations and sexual violence and is trying to "normalize" and increase this unacceptable behaviours.
People don't "Do sex" anymore they "Have" sex. :)