I am actually suprised most people voted pointless, especially here on the escapist, come on guys where's the love?
Sex scenes are never pointless in any type of film. I'm about to talk some serious human evolutionary biology here, trust me it's interesting stuff =)
Sex, to us as a specise, is equally about strengthening the bond between two people, as it is about procreation. We are far more social than other animals, and sex is a big part of our social structure. This is the reason we have texts like the karma sutra and why we don't just deposit sperm, we partake in the act of sex as if it were an art form.
You can never have a meaningless example of sex, every example has a different deep meaning to it, even a one night stand with a stranger has deep meanings behind it.
The reason sex offends some people is because of how private and intimate an action it is, and that combined with the strict milituristic social norms we have come to accept in society.
Sex is a huge part of life and something that should be celebrated as a free act rather than a sinful disgrace of human privacy.
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OT: Sex in films is never pointless, every sex scene shows an intricate relationship between two people, the type of sex scene defines the emotions linked with it.