I have done that several times. Most women don't look in that direction or just look once and then look away...
But a few girls look directly down to that area. These women are very interested in the male bodypart and have within a second discovered that once zipper is down or if you have a boner...some of them just dont stop looking.
And that is very exciting
Now to the story I want to share:
A few days ago there was a pride festival in town and i was going through town by the metro. I guess you all know what kind of outfits some people are wearing at these happenings...
I was wearing my favorite old jeans shorts (the zipper is sometimes going down when i have my hands in my pocket..). At one station some people from the festival entered the train. Three girls (age around 20) entered the door were i was standing and one of them had a see though top. I could not take my eyes from her boobs, really big saggy tits with enormous large dark areolas. I have never seen a girl in her age with that kind of floppyness. She had both nipples pierced. Everything was clearly visible. She noticed that I got exited by her wonderful tits and started to shake them to tease me...
I got an instant and obvious boner
I started to try to hide my erection by placing my hand in the pocket...which of course made my zipper go open!
One of the other girl had noticed my erection and kept looking all the time. That made me even more exited, I had to concentrate not to unload
When I exited the train I was still unaware of my zipper being wide open...moments later a woman smiled at me all the time, after a while she walked towards me and whispered in my ear : "you're zipper is compleately down...and I can see the color of your underwear"
I still wonder if the girl enjoyed my boner or open zipper...maybe both!