For me public toilets are my preferred cruising site, one that is recognised as such of course. This is how I do it; sit in the end cubicle with the door slightly ajar. This method looks like you are genuinely using the toilet but for those in the know they just push it open a little and look straight at you, no words, it's obvious now, he closes the door and locks it. The best part is his cock will be right in front of you, no bending, no kneeling. just sucking, cumming, swallowing, zip up and off leaving the door slightly ajar. There might be someone else waiting.

Let him see you are interested by looking directly at his cock then up to his face. If he wants some action he will turn slightly towards you while rubbing his cock. Move closer, reach out and start wanking it for him. If you get as far as giving him a blow job all the better. Just be careful of other people entering the toilet while you are down on your knees with a mouth full of cock. Go into one of the stalls or find somewhere quite.

It's kind of disappeared recently, but there used you be a popular graffito one would see on the wall above urinals: "Show hard for blow". So follow the advice of this graffito and get an erection and make sure the guy next to you sees it. If this doesn't get a response, start stroking. Odds are you'll have him on his knees sucking you in a flash.