When I was about 19, I went to drop by the house of my at the time girlfriend. I was wearing light blue basketball shorts and no underwear, and I was definitely on display that day. So standing in the living room, I was talking to my gf and her mom, we were standing in a triangle facing eachother talking about something and when I looked to my left (at my girlfriend) I felt like I could see out of my peripheral that the mom's eyes were looking at my crotch, but I couldn't tell if it was just my imagination or not. I got excited, and my heart started to beat really fast and I tried to keep my cool and carry on the conversation normally. So I would look to my right, and address the mom, then back to the left to address my gf, and could never catch the mom in the act of staring, but I knew she was, she was just so fast whenever I glanced over she brought her eyes back up to reach mine.. So I decided to set a trap, and thought I heard something outside, and looked waaaay over my left shoulder to look out the front window, leaving my body facing the mom, this gave her the perfect moment to check me out, and after a few seconds, I snapped back and looked directly at the mom and caught her, head down, eyes wide, mouth slightly open, clearly staring directly at the outline of my dick in my shorts. I wasn't attracted to her, but was extremely turned on by this scenario..