Why does the serial killers targets women in general?

Why does the serial killers targets women in general?

When we read about "Jack the ripper" or "Zodiac killer"... etc, the majority of their victims were women, why?

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If you're wondering who is the guy in the photo, he is the cannibal from the movie "Anthropophagus" filmed in 1980
Why does the serial killers targets women in general?
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