If you live in NYC or have ever watched a hobo urinate on something, then you know just how gross a subway railing is. I'd rather face plant down the entire set of stairs than touch it to save myself. However, it might still be cleaner than most vaginas you've licked after a sweaty night at the bar and no one's probably ever paid you a dollar to do that. So that's something to consider.
This actually reminds me of the time in 5th grade where I paid a kid $5 to put his bare foot into a toilet bowl full of my shit. It was HIS IDEA and he wasn't poor, which makes me speculate about how he spends his free time these days. I bet he's deep into the jenkem scene. Well, that or felching -- you never know how people's sick fetishes will evolve.