Hi. I answered this on that other topic that you posted but if you dont see it i'm answering here too.
well you can pee when your hard, like when you wake up with a boner but you still have to pee. when you get the clear sticky stuff that is different from pee. is it while your masturbating or "at the end" of your masturbation session? after you get the really good feeling?
this probably sounds complicated but if it's clear and sticky while your masturbating it's "precum" makes it feel better as your stroking your penis because it's so slippery. If it's what comes out right when your getting the really great feeling, the pleasure, then it's what is called "cum" or semen or sperm.
the really great feeling is the "orgasm" and you'll know if you get one because it will feel so good, like the best feeling you've ever had.
Jason