エロ漫画 同人 レビュー 天鹿 | 【科学】正しい自慰行為の頻度3選

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【科学】正しい自慰行為の頻度3選

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■動画の紹介商品
T系メンズサプリメント「TEXY」はこちら
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※当チャンネルは「性的満足を目的とした内容」ではありません。「性的な教育やノウハウ」について分かりやすく学べる動画内容となってます。

〜参考文献〜
Ejaculation Frequency and Risk of Prostate Cancer: Updated Results with an Additional Decade of Follow-up(PMID: 27033442 PMCID: PMC5040619 DOI:10.1016/j.eururo.2016.03.027)
A research on the relationship between ejaculation and serum testosterone level in men(J Zhejiang Univ Sci. Mar-Apr 2003;4(2):236-40. doi: 10.1631/jzus.2003.0236.)
About the National Survey of Sexual Health and Behavior(https://nationalsexstudy.indiana.edu/ )
Influence of the abstinence period on human sperm quality: analysis of 2,458 semen samples(JBRA Assist Reprod. 2017 Oct-Dec; 21(4): 306–312.
doi: 10.5935/1518-0557.20170052)
Ejaculation Frequency and Risk of Prostate Cancer: Updated Results with an Additional Decade of Follow-up(ditorial by Sarah K. Holt, George R. Schade and John L. Gore on pp. 983–984 of this issue)
Sexual Activity the Night Before Exercise Does Not Affect Various Measures of Physical Exercise Performance(2019 Jun; 7(2): 235–240.
Published online 2019 Jan 21. doi: 10.1016/j.esxm.2018.12.002
PMCID: PMC6522944

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