First and only time for this way.
In college I dated several girls and with one I had an interesting event happen. While kissing a girl, one of my hands move down her pants and fondling her ass. With heavy kissing, the ass touching was too much and I had an experience I never had before, I had an orgasm in my pants without any touching! Now I am no stranger to girls or masturbation, but this time the orgasm was like having a wet dream while being awake! So I enjoyed to 'fun', and kept kissing, fondling, and got another erection. I never had the experience again, so it was one of those rare events that is remembered.