I probably should have prefaced this with "try at your own risk, results don't reflect the author's opinions"

I think subtraction is broken. None of what I tried made any sense. Water - oxygen = gin and tonic.

Telling that Jewess, feminist, and spinster were near matches as well.

woman+penis=newswoman (businesswoman is second)

man+vagina=woman (ok that is boring)

Man - brain = Irish sea