Most of them just have the same cum type as humans, it's only the DNA inside the sperm that differs (and with how compatible most species are, that's an incredibly small difference). The only reason to distinguish between the cum of different species is if some tangible, macroscopic property of their cum is different - things like colour, taste, texture and/or consistency. For example, zil have honey-type cum because their cum resembles honey in all those regards, while nyrea have their own cum type because it's different to every other species out there.
The same logic also applies to girl-cum and milk; if other bodily fluids had their type tracked, I'm sure the logic would apply to them, too.