gals do not have any cum at all, they have lubricants, this
lubricants are thicker during their period and they smell too. They
are less thick on normal days and less smelly too.
Of course it depends on each gals how they take care of themselves
and what they eat affect the density of their lubricants.
With experience you will know that each gal is different, but you
have a lifetime to find out about them and their lubricants, so no
hurry pal. Try one gal at a time