The risk-reward calculation for women is dramatically different than for men.

For men,

risk: not get laid, deal with rejection. reward: get laid, possibly meet soul mate

For women,

risk: person you matched with rapes and murders you. reward: get laid, possibly meet soul mate

And before anyone tries to rebut this with the tired argument of "sometimes women commit murder" yeah that's true but exceedingly rare. The overwhelming number of violent crimes are committed by men.