i like to sit across a female +18 yrs old on the train and stick my hand in my pocket and feel my penis until erection start they usally notice and give me a smile by then they know "whats-up" then i stick my hand right down my pants and start rigorously masturbating if they seem interested i contuie still making small talk. then i "go-to-town" i whip-it-out and call them a slut. and i usally cum right on myself (the pant leg) i get up and move my seat and tell them to have a nice day.