I'm a guy in my early 20's who remembers vividly some turn ons from my childhood that still turn me on today when I think about them sometimes.
There were several times when I got hard ons in elementary usually because of stuff I had seen, which were mainly attractive teachers or attractive students. Some of my teachers would wear short skirts with pantyhose underneath. I remember seeing one teacher bending at her knees talking to a student. I could see up her skirt and she was wearing tan pantyhose but I wasn't sure if she was wearing underwear. My music teacher in elementary was also very sexy and wore short skirts and had very nice legs. In 5th grade, my teacher was sitting in front of the class on a chair talking to all of us. She was in her early 40's but I got turned on by the way she was sitting. She was sitting kinda crossed legged with one leg over the other but not completely over. It kinda reminded me of the way Sharon Stone sat in Basic Instinct. I got a gorgeous view of the underside of her right thigh clad in black pantyhose and it gave me an immediate hard on. I masturbated because of this incident for the following days.
One thing that turns me on is seeing a girl in tights or pantyhose. Some of my aunts would wear these often and looked sexy as hell. I remember one of my aunts taking me to the mall with her. She ran into one of her friends there next to the changing rooms. She was in her late 20's. I was only around 9 or 10 at the time. They talked and my aunt helped her friend out trying on some clothes. There were some chairs next to the changing room so I sat there. Her friend opened the door to give my aunt the clothes she just tried on and I got a great view of her. She was wearing a white bra with sexy black pantyhose. She didn't seem to care that I was there but boy it was a turn on.
I have more to tell but I'll save them for later.