hey i have recently been thinking about this alot and i think its a greate idear yes there would be alot of penis's but i think there would be alot in real life aswell, just a few pros/uses could be you could use it to find your base, by like say putting a line or so on a tree and you will know like at the yellow line walk 5 mins east and so on, so help navagating you could spay everyone in your teams leg or arm so you could identify friend easier, because as it is its quite hard to tell friend from foe if you had a white car with a few cans it could be sprayed a diffrent colour or colours and people want weapon customisation why not just give it a sweet paint job? when you find i tent you could just spay it or write somthing on it, so that would make it a bit creepy so basicly endless possibilties and i gess downside, dicks everywhere but i think it would be sweet :)