I personally didn't notice the difference at all (the body fluid provides a dependency jump, so I never wanted to waste it in the XMod).
I tested it quickly.
This is what it looks like in the Prime Mod
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Like this in the XMod
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By the way, while I'm posting, there's something I've been meaning to mention for a while, but it's nothing game-breaking. I can live/play with it. But I wanted to mention it:
Colouring the penis of the vagina is kaput.
The following selection is available at the start of the game:
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But in the game the default vagina or penis is displayed:
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The user-defined selection is not even available in the laboratory options:
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As say, nothing game-breaking. I'll just stick with green instead of obsidian black.
The big plus of this mod is the ability to colour the clothes and lips. And of course the cheat options and all the trimmings.