The cop also told her that her alleged attacker “must be a nice boy” because he went to church.
The Sun on Sunday asked forces to give details of disciplinaries for racist or sexist comments in the last two years.
The officer allegedly told the woman: “I’m quite old-fashioned in my approach and want to ensure this is not just teens and urges.
“Boys will be boys, there will always be primeval instincts.”
Avon and Somerset chiefs told him to “reflect” on his behaviour.
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British Transport Police declined to fire two officers filmed holding up a black Jelly Baby and joking about “f***ing darkies”.
The pair were in uniform and at work at the time, using filters to change their voices and appearance.
Both were given a final written warning.
Another BTP cop avoided the boot despite using language that “could be deemed racially discriminative.”
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Officers who called travellers “p**eys” kept their jobs with the Thames Valley force.
And Bedfordshire Police admitted a cop who slapped a female colleague’s bottom was given just a written warning.
Andrea Simon, of End Violence Against Women Coalition, called the lack of action a “disgrace”, adding: “We need to challenge and change harmful attitudes.”