Women are naturally prone to compete over their mates.
Romantic love is an addiction.
I can't conceive of caring more about my president than my own partner.
We're not very dangerous animals; we don't have a horn like a rhino or quills like a porcupine.
Any kind of novelty or excitement drives up dopamine in the brain, and dopamine is associated with romantic love.
A woman of 40 or 50 or 60 can take estrogen replacements, get facelifts, spend her money in bars.