Jacking Off While Jogging
One of my big turn ons about 15 years ago, when I was jogging regularly in the city during my lunchhour, was to wear white cotton panties under my running shorts. They were "Jockey" brand, and to any locker room observer they might appear to be just bikinis with no fly - but I knew better. I generally ran from the health club along the Embarcadero thru Fisherman's Wharf out on Aquatic Pier and back - about 5 miles.
There were occasions when jogging alone, and thinking about the panties I was wearing made me horny. I'd conjur up thoughts of some cute girl in the office, and how it would be to have her her knees giving me a nice slow blow job until I shot cum down her throat. If there weren't many people around I used to love to slip my hard penis out of my running shorts and panties and masturbate at the end of Aquatic Pier on the bench facing Ghiradelli Square behind a round restroom facility. I'd have to do this discretely, because someone could happen by anytime. After stroking for a few minutes, I would tuck my spurting cock back into my shorts, and ejaculate directly into the crotch of the panties.
I loved the gushy feeling of the cum-soaked panty crotch against my cock and balls as I jogged back. This JO scenario was repeated many times as my mood dictated. Public masturbation like that is exciting for me, especially with that element of risk of being seen.