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Hi there, Thanks for writing. Are you referring to this video by Dr. Marty Klein?

https://www.empowher.com/share/reproductive-system/sexuality/video-sex-d...

There is some association between ejaculation and prostate cancer, especially if you have pain during ejaculation. In addition to the above information, you may want to check out link:

http://www.cancer.org/docroot/CRI/CRI_2_3x.asp?rnav=cridg&dt=36