I think you’re saying that since you engaged in doggy style sex you have had pain and bleeding when you urinate. Rear entry sex isn’t dangerous at all. It sounds like you have a bladder infection, which may have been triggered by sexual intercourse. You see the bacteria that is normally on your partner’s penis can migrate inside your urethra and cause an infection. Likewise, the normally occurring bacteria that ‘s outside your body can also find it’s way inside the urethra as a result of intercourse. It has been recently shown that most bladder infections are caused by E. coli bacteria. E. coli bacteria lives in the bowel and it is possible that the rear entry position transmitted this bacteria to your urethra (the tube that carries urine from the bladder to the outside of your body). Another common way women develop a bladder infection is by wiping from back to front when they urinate, thereby spreading the eColi bacteria to their urethra. In the future, make sure that your rectum is very clean before you engage in rear entry intercourse. This should help protect you in the future. Meanwhile, see your doctor and have him or her do a urinalysis. It’s as simple as peeing in a cup.