Studies evaluating the effect of circumcision on the incidence of other sexually transmitted infections have reached conflicting conclusions. A meta-analysis of observational data from twenty-six studies found that circumcision was associated with lower rates of syphilis, chancroid and possibly genital herpes. A large randomized prospective trial in Uganda found a reduction in HSV-2 infection, but not syphilis infection, in the circumcision arm of the study. In contrast, some studies have failed to find a prophylactic benefit to circumcision. A prospective trial in India found that circumcision offered no protective benefit against herpes simplex virus type 2, syphilis, or gonorrhea. A clinical study of 5,925 women from Uganda, Zimbabwe and Thailand found that the circumcision status of their partner did not significantly affect the incidence of Chlamydia, gonorrhea or trichomoniasis. Laumann et al. examined observational data from the United States and found no significant differences between circumcised and uncircumcised men in their likelihood of contracting sexually transmitted diseases.
http://en.wikipedia.org/wiki/Circumcision#Medical_aspects
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