A friend of mine made a point the other day that I thought was insightful.  If matter is all that exists, and there is no free will because everything is either determined or indeterminate, then there is no real distinction between rape and consensual sex since the distinction relies on the notion of free will.  If the will is not free, then strictly speaking, no act of sex is chosen—even so called consensual sex is not chosen.  Every act of sex is chosen for us by forces that lie outside of our control.  We may think that we choose to engage in sexual activity or choose to refrain from doing so, but these are just illusions.  Prior physical processes cause us to either have the desire to engage in sex or the desire not to engage in sex.  

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