I have a friend who lived across the street from an inner city "relief station" she would run out and directly confront the guy while in the act.

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An engineer friend of the family had a frame house that was on a dog trail. As each male canine passed that corner, it was marked. Needless to say, this was a very stinky corner that was destined for rapid deterioration. He placed some metal widow screen on the corner and on the ground around -- with a difference of potential. The goal was to sting a certain sphincter muscle. After a few days of experience, passersby would bark at the corner, but none would mark.

While laying this sort of obvious trap for human visitors could expose one to legal issues, I'm not sure if a perpetrator would want to explain to a court exactly how he was exposed to this "injury". That said, we've all had countless issues with cable feed ground loops -- it might be possible to constructively arrange the location of an ungrounded cable feed ...

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By the way, in my area this is not an exclusively male activity.