I AM 30YRS OLD AND I HAVE BEEN WITH 2 GIRLS FOR OVER 2 YRS AND WE DO FULL CHECK UPS EVERY YEAR. MY GIRLFRIEND HAD A YEAST INFECTION AND SHE WAS TAKING MEDICATION AND STOPPED. I ALSO HAD ANAL INTERCOURSE WITH THE OTHER WOMEN. BOTH OF THEM AS WELL AS MYSELF ARE CLEAN . BUT I BEEN HAVING A NUMBING SENSATION IN MY PENIS SINCE MY LAST SEXUAL INTERCOURSE. THE FEELING COMES AND GOES IT FEELS LIKE IT IS IN THE SHAFT OF MY PENIS BUT IT COMES AND GOES. I ALSO MASTURBATE FREQUENTLY AS I AM A VERY SEXUALLY ACTIVE MAN. I HAVE NO OTHER SIGNS THAT IT COULD BE A STD OR UTI. I AM CONCERN BECUASE IT IS THE FIRST TIME IT HAS HAPPEND TO ME . . CAN ANYONE HELP ME.