All in one I think. But then you need more stuff afterwards, too. Here is a shortlist:
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- Provide a sweet new way to move models in Studio than the shit Illusion made.
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- This is so you don't need Hanmen's shader bullshit when you load a character and she would normally turn gray.
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- This mod adds new sex positions. Fuck yes.
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- This mod changes the whole game scenario. Trust me. Read the manual it comes with. You can still play as normal by turning off the buddy mode. Buddy mode is where your second male character card option follows you to the fucky.

He sits there or stands mostly, and spits out the odd Japanese insult about your dick being larger than his. You can leave him there to live vicariously. Or you can invite more girls to the party, as well as more dudes. In learning how to get couples to hook up, before you know it, orgy mode.
There are other great mods/plugins but those I love most.
Because Xyth24 is a fucktard.