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ヒトを含む霊長類の自慰行為は、少なくとも雄にとっては、生殖の成功率を高めるとともに性感染症（STI）への罹患リスクを低減させる効果のあることが、英ユニバーシティ・カレッジ。

心理学教授のアレクサンドラ・カシス氏によると、ネガティブな感情を抱いたオナニー 免疫力時に自慰で発散しようとするのは、不健康なトラウマ (心的外傷)反応な可能性があるそうです。 自慰による。

オナニーや射精は、免疫機能の向上にも寄与することがいくつかの研究で示されています。 射精後、体内では 白血球 が一時的に増加し、これにより体内の防御機能が強化オナニー 免疫力されることが観。

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