Lower right back pain with erections. occasional lower right penis and right pelvic pain as well. pain is mild and does not interfere with sex.

Prostatitis?: Prostatitis can masquerade as a lot of different symptoms including pelvic pain right or left sided pain groin pain even low back pain. On occasion a distal ureteral stone can also have these symptoms. A urinalysis and a thorough exam by your primary care physician including a rectal exam examining the prostate would be beneficial.