Are there any sexual abusers out there who are lesbians that women ought to be cautious of?
Not entirely sure what to make of this question, but yes, there have been instances of a bad person being a lesbian. Lesbians are like everyone else, they have good ones and bad ones, smart ones and dumb ones, and - sad to say - even those who are sexual abusers.
I should have to think that if someone is not lesbian, they are unlikely to meet up with a sexually abusive lesbian. By far the most common sexually abusive predator is the heterosexual male. A lesbian "rapist" of strangers is not something I've ever heard of.