I'm looking for manga in which the main character is living together in the same house with someone of the opposite sex who isn't related to them by blood (the only exception to this condition is that if they're the same sex then the other person has to be the love interest, meaning it'd be shoujo-ai or shounen-ai).

It could be any scenario. Living together in a dorm, in an apartment, step-siblings, etc.

I'd prefer if it wasn't a married couple (like futari ecchi).

And the age of the characters living together can be close or very different, and it doesn't matter if they're kids, teens, or adults.

I know a lot of you will probably say a lot of the obvious ones( hana kimi, power!!, baby pop, parallel, etc) but please try and think of uncommon ones :x

Feed your head.

good morning call
sorry its the first that comes to mind...

Boku ni Natta Watashi
though i didn't really like this one...

nor the other too much for that matter >_>;

[img]http://img.userbars.pl/69/13603.gif[/img]

Dousei Recipe, off the top of my head.

[img]http://i604.photobucket.com/albums/tt122/Wthuh/CrenshiSig.jpg[/img]
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I guess Living Game...?

Complete
Ai Hime - Ai to Himegoto
Akuma de Sourou
Akuma Jiten
B-Shock
Bloody Kiss
Crossroad
DearS
Hiatari Ryoukou
Ijiwaru Shinaide!
Inumimi
Living Game
Love Hina
Mahoraba
Maison de Beauties
Maison Ikkoku
Marmalade Boy
Midori no Hibi
Misty Boy
Miyuki
Nijiiro Togarashi
Oneesan no Jijou
Onegai Twins
Pretty Face
Scandalous
Shinigami Lovers
Suzuka
Tenshi ja Nai!!
Wish

Unfinish
Gekkoh
Baby Love
Ah! My Goddess
Family Compo
Kindan no Koi wo Shiyou and it's 2 sequels
KissxSis
Momoiro Sango

Hotaru no Hikari - OL living with her older boss

Fate Stay Night FTW.

Death should be embraced, not rejected.

Full House Kiss

[img]http://dragcave.net/image/k2sM.gif[/img] [img]http://dragcave.net/image/JN5L.gif[/img]

Please Click on my Eggs!

Apart from the ones already mentioned I can only think of...

Sprout
Nanaco Robin
Faster than a Kiss:

I recommend all three, though not many chapters in each series have been translated, they've very enjoyable ^^

Perfect Girl Evolution, though it is kinda obvious

i second:
Full House Kiss
perfect girl evolution
Nanaco robin

and:
It's Not Like That, Darling
Yoru Made Matenai
Toraware no Minoue
Goong
Crimson Hero
100% perfect girl

Shounen Ai:
Demian Syndrome
Keep Out (KISARAGI Hirotaka)
Gohou Drug
Get the Moon
The summit
Vassalord
Shibutani-kun Tomo no Kai<< both shojo and shounen ai

** "It's so warm that, Before the snow has a chance to stick, He melts it for me." **

Yep, I third Full House Kiss and Perfect Girl Evolution

May the Chocolates of Heaven be on your side.

[img]http://img30.imageshack.us/img30/1641/bannersmall2o.gif[/img]

Tenshi ja Nai!!
Pig Bride

Honeymoon Salad
The World God Only Knows (not love interest)

And of course (inspired by DearS suggestion):
Ranma 1/2
Urusei Yatsura

Solanin

Trust me, I am an engineer.