I have been masturbating ever since I was 13 years old thanks to my older sister. When I had turned 14, I started going to the gym with my mother. It was a thing we did twice a week, and I enjoyed exercising. At the gym we went to, there was four dressing rooms. One was for children from ages 3-15; and the other was 16+. And of course there was one of each for boys and girls.
I remember when I was finally old enough to go into the older women's changing room. I did not thing anything of it until I went into the room. In the younger changing room, there were individual rooms, with locking doors, but once I walked into the other changing room, things were a bit different. There were 12 showers, six on each side of the wall. The showers were like toilet cubicles, but without a door. So anyone walking by could see you. There were lockers where people would change, and there were toilets.
When I first walked in there, I was afraid. I saw many different nude women, in different varieties. Some were fat, skinny, hairy, shaved, old, young, etc. The first time I was there I did not take a shower because I was not comfortable, especially with my mother there with me.
I think that by next month, I had gotten my own car. So I was able to go on my own. One time I went on a Saturday alone, and I was planning on being a little more daring than I had ever been before. As I entered the locker room, I chose a locker and put my stuff in. I was going to get naked and then change into my work out clothes. So I nervously pulled my clothes off, and then quickly changed. I thought to myself that that was not bad and it was actually kind of fun.
So time passed by, I worked out and did various other things. I came back to the locker room, sweaty and wanting to take a shower. There was only about eight people in the locker room with me, so it was not that bad. So I was at my locker, I stripped down, and gathered my things I needed for the shower. As I was walking to the shower, I saw this young girl, who probably wasn't too far past 19. She was cute, skinny, and shaven. She kind of turned me on.
I chose a shower, and began to wash myself. I loved the feeling of any girl that was passing by would be able to see me. For the first half of my shower, I was facing the wall, but then I thought that it would be interesting if I let my body face the people walking by. Occasionally someone would walk by and glance at me and it would make me horny.
Finally, I finished my shower, and went back to my locker to gather my things. I got dressed and went home and masturbated like there was no tomorrow.
Doing this always made me horny and I suggest that you try it.