My question is does every guy pre cum?

Pre-cum is something that happens to all guys when arousal happens, yes. Pre-cum—officially called pre-ejaculate—is a clear, sticky fluid released by the penis between the beginning of arousal.  Doctors believe that it helps make the urethra and the vagina less acidic, allowing sperm to survive longer.  Some people release a small amount of pre-cum; others may release quite a bit.