Some years ago I (M25) was driving on the highway to pick up my partner from the airport. It had been quite a while since we last met, so naturally I was extremely horny by the prospect of meeting them. I had this naughty habit of listening to either audio porn or voice recordings of overheard people having sex - it drives me crazy. So, here I was in the car listening to that getting hornier and hornier. I can't resist anymore so I pulled my cock out. I drive an automatic car and the road was quite empty so not much to stress about. Listening to an audio instruction telling me to masturbate in public, I didn't say no, I start jerking off right there. I kept my eyes on the road in front, ears carefully listening, and I didn't see that a woman trying to pass me by realized that I was masturbating. As the two cars on the road, she kept staying right next to me, eyes towards my hard cock. It was so hot I came so hard I had to pull over soon after to clean all the mess I made. A bit dangerous, but terribly exciting