To quote Del Boy:"Lots of it, all bad". Although I don't think he was talking about cruising public toilets.
What the f*** am I talking about?!?!
If your question was serious, I did once go into a public toilet in Dublin and a guy there was openly masturbating (I wrote wanking, then changed it) - I tried to ignore him, then he came and stood next to me. I looked him right in the eye and said, "What the f*** are you doing? Look at you!" and he seemed genuinely shocked.
Also, one time in Bristol I saw a homeless man with a massive appendage masturbating at a bus stop at 3am.
I seem to attract wankers..