In Elaine Morgan's works (see "The Aquatic Ape" - "The 
     Descent of Woman" - "The Descent of the Child" etc.) - 

     we learn that human "sex crimes" were impossible before
     the present - and temporary - stage of evolution, for the
     following reasons (receding back in time):-

     until fairly recently our primate female ancestors had to
     show physical 'consent' signs to give the males 'permission'
     - flexible courtship rituals applied, giving the necessary
     selection (by the females); 

     slightly earlier, mammalian females had to exhibit physical
     signs (along with pheremones) of oestrous ['heat'] before a
     male would respond - ie. the courtship rituals were stronger,
     more instinctive;

     even earlier our ancestors experienced only a short mating
     period when both males and females experienced 'oestrous' - 
     but selection was still practiced on the part of both male
     and female. We might think of such courtship as instinctive,
     but that's probably modernist-chauvinism speaking.

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              FURTHER REFERENCES

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