Many times this is done in a plausible format and sometimes it is done from a strict fantasy format whee it may be more comic book than realistic.
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It is normal to become aroused and enjoy this form of material so do not feel embarrassed or ashamed.
And, the reasons for this are embedded deep within our psyche.
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Hollywood learned a long time ago that sex and violence sell.
All content is consensual and is acted out by models of legal age.