Nothing to do with gamers. It's culture. Sex is a primal human instinct. Breeding is built into the human DNA. Humans are sentient beings with the ability to generally control instinct. Controlling instinct however doesn't change that humans are still influenced by instinct. Unlike some animals humans won't kill other children of another man's after proving himself more worth to continue his genes.
In our many beliefs the higher self in encouraged. This means that the lower instinct self should not be in control. Often the beliefs become social norms, culture norms with no spiritual meaning. Sex is one of the prime instincts and so is seen that expressing sexual behaviour is against the norm.
In the end all humans(exceptions are not counted) are in a way perverts and it has nothing to do with gaming. However the sub culture of gaming only influences sexual stimulation. So seeing hot chicks from video games is just a view of the "perversion". I wonder what a country/culture would like if sexual expression was encouraged rather than frowned upon by the social norm.
Squilliam: On Vgcharts its a commonly accepted practice to twist the bounds of plausibility in order to support your argument or agenda so I think its pretty cool that this gives me the precedent to say whatever I damn well please.
