Im guessing you mean you want the girl to drink your pee. (yes Im being nice)
Well...likelyhood is, you'd need to find a girl that is into that and have a decent understanding / rapport with her built up over time.(with decent girls anyway)
Also you cant just turn up and piss, you need to hydrate plenty, try and not drink or eat certain stuff hours before , the idea is your urine is as pallatable as possible
, and not looking and smelling like something from nuclear waste. Try wasting a few hours on Fetlife instead of here
If all else fails, Im here
as long as you drink loads of guinness the night nefore, OH Im veeeery open minded
Research my son after you finish School, and get back to us