none (@Forgo7ten) 在 想变持久的佬友们有福了 中发帖
今年的新论文: A Study on Male Masturbation Duration Assisted by Masturbators | Journal of Innovations in Medical Research
PDF见 View of A Study on Male Masturbation Duration Assisted by Masturbators(PDF)
结论就是善用杯子可以提高时间和硬度 :tieba_003: 感兴趣的xd可以拜读一下