My own personal first experience was probably about 15 years ago. I’d read about a glory hole at the local university library toilets on Squirt.org and managed to carve out some time in the middle of my work day to stop in and check it out. A hole just big enough for a cock to slide through. The adrenaline was off the charts. I sat down and within 5 minutes someone had taken the stall next to me and the dance began. Subtle stroking of the cock, leaning back to show more, openly stroking, the finger caressing the hole as an invitation. I must have serviced three cocks over the next hour. I was hooked.