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