Let me share with you an experience that happened to me last year. When I turned 16 (I am 17 now), my girlfriend ( 5 years older) bought me several very high cut white thong leotards with matching tights because she thought I looked kind of sexy with those. She started to go to see me practicing ballet and the way she looked at me really turned me on. I was excited not because of the leotards nor the tights but about the way she looked at me. By the way, I never had the idea of "masturbating" specially since I was dating, which I still do, this beautiful women.
I did follow another way to help myself release the "tension". During lunch break (I always have full days of rehearsing), we used to enjoy sex, and we still do, frequently in very different spots ( I tried not to use the studio, but sometimes secretly we did). Needless to say that this helped me out a lot and masturbation was never in front for consideration. I will suggest you to tell your girlfriend, if any, to help you out too with your manly natural needs.
I am not, under any circumstance, saying that this should be done but if you need to respond to your natural needs, please do it following some socially stablished guide lines.
Best regards...[/i]