Eh, an argument could be made that having the local population of women who are at least slightly unhinged identify itself and thus eliminate the headache of potentially sleeping with one of them or, worse, getting emotionally attached to another such individual before realizing that being around them for extended periods of time would basically constitute emotional and spiritual abuse.
And if you let people potentially being [redacted] insane stop you from doing something, you're going to be paralyzed in this life.