hey there, recently I've had a strange sensation of a warm/hot feeling on the tip of my penis. I have never had unprotected sex, and last time I had sex was over a year and a half ago. I do not think it's an STD because I have only been with one girl and we were both each other's firsts with everything we did. I masturbate maybe once every 10-12 days so I do not think it is that. My penis does not hurt when I urinate and there is no discharge. This sensation has been going on for about a week or two. Any input would be helpful. Thank you.