hi found you this as a very good answer to your question young men who are sexually active with more than one person face an increased risk of prostate cancer in later life. research to emerge from the karolinska institute in stockholm points to sexual promiscuity as a leading risk factor in contracting human papilloma virus (hpv). already linked to cervical cancer in women hpv may explain why there has been a recent upsurge in prostate cancer in men. if correct the theory is that once young men are exposed to hpv it kick-starts a chain of genetic mutations that can eventually lead to cancer decades later. this comes from this link <link> just copy this link into google to open and read for more info. do hope this helps you. good luck
does promiscuity in black men cause/enable for prostate cancer?