I'm having too much natural lubricant coming form my penis

Hi!
I'm having a problem - kind of disorder!
When I get horny (if I think of sex or see a porn movie or when I masturbate) my penis gets all weat(clear oily substance coming out of my tip- natural lubricant i suppose).
The problem is that I have it too much of it!
for example if I masturbate in the first minute I'm already all wet and I need to wipe it of every now and then or it gets on my hands. It's kinda disturbing.
Or when I get together with my girfriend and we kiss for 5 min and I'm all weat in the pants.

Can this problem be resolved with a medication?
Where does the natural lubricant come from anyway?

Thank you for smart answers!

I don't think you can decrease the amount of precum.