Brought to you by whoever that sorta weird guy is who hopes he makes neat mods that at least some people enjoy, is a revision of a much older mod by Luchaire: Nova Interaction Revised Revised! (As was the working title (Not really, but I thought it was fun))

The only thing this does is, if Nova is sleeping in your rented Moriarty's Saloon™ room, make a message box show up before you sleep in the same bed, asking what you would like to do with her.
Finally, you have the option to actually refuse her advances, with a perfectly-reasonable explanation for why she might still be there when you wake up!
This box has no bearing on gameplay, just your own mind, so worry not that your character may receive an unfair advantage or whatnot early on; this will do literally nothing as far as gameplay is concerned, barring (Once again) the impact it has on your own perception of your character, Nova, and anyone or anything else.

Once again, this is just a message box that pops up when you sleep with Nova in your bed, allowing you the roleplay choice of either utilizing her services or not.
No actual effects on gameplay, just you, the player.

If you believe the cost should be reduced for not taking advantage of the company, think of it this way: That is simply how much Moriarty charges for a room, and Nova is merely incentive to do so. She of course takes a cut of it, as Moriarty wouldn't want to be thought of as someone who completely stiffs his workers; no one else might want to get in debt with him! He expects them all to take advantage of her anyway, so no harm done.

Versions:
New Edition:
 Making the message box show up when you activate the bed as long as Nova is also in it or making her way to it, instead of the way the original mod handled it.
Original Flavour:
 The new message box shows up when Nova reaches the bed, but not if you're a distance from her once she climbs in or beat her to it.

Requirements:
Fallout New Vegas
Fallout 3's ESM loaded in New Vegas.
Strictly speaking, TTW isn't required, but it is highly recommended for this mod.
NVSE
JIP-LN Plugin. I could probably technically do without both NVSE and JIP, but they just make things so darn convenient!
If there is actual serious demand for versions without them, I'll give it a go.

Credits:
Luchaire, for the original mod and permission to reupload it with my changes.
Me, for basically rewriting the whole thing.
Bethesda, for the weirdly-ambiguous thing with Nova, encouraging someone to remove a choice piece of that ambiguity, and the tools to do so.