I actually do think there would be less. If you are a lesbian, and in a committed relationship with another woman, there is pretty much no chance of unintended pregnancy. That alone would remove a huge stress that heterosexual couples can face, one that sometimes does result in abuse.
Do I think that lesbian households are completely free of child abuse, probably not, as sexual identity doesn't really preclude one from being abusive. But I do believe that it would be less due to circumstances of planned child rearing.
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