Just spitballin' here but this scientifically adds up. First person shooter games are generally war simulators that get the blood boiling but also raise testosterone levels.
In the brain eliminating enemy strangers plays a key role in evolution. Testosterone is necessary for normal sperm development. It activates genes in Sertoli cells, which promote differentiation of spermatogonia. It also boosts libido(sex drive), mental and physical energy to boot.
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