I have a couple times in cycling tights while riding. Hard on stuck in one leg, thigh pumping up and down, my erection moving up and down against warm moist skin of my inside thigh, precum oozing out then shooting a load. Riding alone bent over handlebars no one noticed the long hard lump, the wet spot in black tights or the wetness which escaped down my thigh. Many other times just a precum wet spot.