Upon request of another user I will tell my favourite stories of seeing a girl/woman with her zipper open and also of leaving my zipper open on purpose
The oldest story I still remember probably happened in the year 2002 or 2003, I was at the discotheque together with a friend. Two girls were dancing next to me and I noticed that the zipper on the jeans of one of the girls was completely open
I got turned on so much that I went to the toilet, left my zipper completely open on purpose and returned to the dancefloor, to the spot with the two girls. I am not sure though if they noticed my open zipper, I can't remember anymore if they showed any reactions, maybe they were too busy dancing ^^