WrongBot:

Inequalities of material wealth have killed many millions of people and will kill many millions more. Inequalities in matters of love and sex have not.

While inequalities of love and sex don't usually kill, I would claim that those inequalities can be significantly harmful. For people who want to have partners, not being able to tends to trash their mental health. Look into involuntary celibacy, and love-shyness. Gilmartin's work on men with "love-shyness" who experienced significant heterosexual anxiety and impairment found them to be depressed and have violent fantasies. They had suicidal thoughts, but he concluded that they were too depressed to even attempt suicide. His book can be downloaded for free here (despite the caveats on that page, it is a must-read for anyone who finds that these difficulties ring a bell).