It does the lights, not the water directly.  If it's not night, or nobody's in it, there won't be any effect.  If you've got someone in there at night and it's still uncolored... well, works fine for me, so I'm guessing its a local problem.  Low graphics settings, perhaps?

If you want to inspire some experimentation, select the other sim, order them to do something romantic towards your sim, and switch back.  One interaction should open the door.  Of course, if they're homeless, you'll have to add them to your household (either talk them into moving in, or just turn on the basic testing cheats and add them that way) and boot them out later if you don't want them around.  Side effects may include losing NPC status, taking up a random lot, and demons pouring forth from the bowels of the earth to devour all you love and hold dear.

EAxis forgot an important check in the "ask to go skinny dipping" interaction: under "friendly," adults can ask children to go skinny-dipping.  The option is grayed out, presumably due to the "no skinny dipping when children and teens are on the lot" rule, but it's still a little unpleasant to see it just looming, like a creepy uncle.  EAxis, why don't you take a seat right over there?

I may regret this...
Heh... add that to the Sims, and you'll have made it harder than I Wanna Be The Guy.

Your quote is a bit lacking in context.

(Emphasis added.)  If you don't care, it's only because EAxis failed at their job, which was to make you care.  For a lot of the forum members here, I suspect EAxis had their work cut out for them... basically, my point was, I play The Sims to enjoy being the capricious over deity of a bunch of little virtual dimwits, and I don't want competition for the title of "most dangerous thing in the Sims universe" from a bunch of NPC bloodsuckers.

Just a non-sequitur thought: is there any way of telling the difference between stupid n00bs and amateur-hour trolls pretending to be stupid n00bs for easy laughs?  (I suspect the answer is no.)

I don't like that, really.  When I want to watch humanoids live short, brutal lives that end in agony for no good reason whatsoever, I grab seven dwarves and send their short asses to some place with a name like the Mire of Ooze.  In the Sims, you're supposed to care about the little blighters under your command... even if you only care about them in the same way a cat cares about a mouse it's just caught, and has decided to torment before the killing blow.  I don't like the idea of random murders in the Sims universe, save those that are part of my unholy will.  (My sig is mostly tongue-in-cheek.)  Also, vamps with the Wuss Good trait shouldn't be able to commit any aggressive bloodsucking, if such is implemented.
Perhaps those who willingly allow you to chow down on them should also be at less risk.  Say you can get a snack via either beating the stupid out of someone, or asking someone the old fashioned way.  The beat-down method might drain with a one-to-one ration, while a willing drain would be, say, three-to-one; three points of vamp chow for every one point of hunger the sacrifice loses.  Say the vampire doing the draining can concentrate on not harming his lunch or something.

You mean the Explode in BFBVS switch?  I remember that!  The second I saw it, I knew I had to try it.  So I backed up all my saves, turned it on, and LOLed at the results.


Another nod of agreement.  Hospital raiding is kinda useless right now, with one exception: my Crazy Hobo Vampire has no other source of blood (being a Crazy Hobo means no fridge and few friends).  Suffice it to say, I'm tired of spending so much time looting only to have my spoils... well, spoiled.

Nice!  A bar that fits on a realistically sized lot, looks good, and doesn't require any work from me!
Once you've finished all the bar types, if you feel like it I'd suggest making a bar for the WA places.  Because what's a visit to Egypt if you can't get go to a shady pub, get drunk, and cheer for whatever team all the locals are rooting for when a football* game comes up on the ancient TV hanging behind the bar?

*a.k.a. soccer

Yeah, I'm seconding that vampires need a decent method of immorally obtaining blood; maybe their hunger meter should be filled/increased by winning a fight.  I'm also going to agree to a "tastes like fridge" moodlet for all fridge-obtained plasma, but that seems too merciful.  I'm not in charge for a variety of good reasons, but I'd throw in a statistically significant chance for something really hilarious to happen.  As a random stupid suggestion, perhaps a bad batch, one in ten or so, gives you three days to live and can only be cured by drinking the blood of a hunt target (to make that mechanic worthwhile).  Something in that vein, maybe less or more brutal depending on the whims of Pescado.  Make it a toggle-able option if you want to avoid whining from the weak, but if you do, set it to on by default as a punishment to those who fail to RTFM.