I was talking with my girlfriend- suddenly topic changed and it switched to some erotic conversations I got erection it was hard enough but I was feeling like to ejaculate but I have not touched it I was able to control erection when topic switched I lost it but when same topic came I again got it - but at the end I had to squeeze my pennies I controlled a lot during squeezing but suddenly I felt a not controlled sensation in my pennis and ejaculated. Is it a normal thing or a problem that need to be addressed?