I share a twin bed with my girlfriend. I love being next to her and if I can have it my way, I will never sleep in a bed without her again.
A twin bed for two people? If so, how?
My eventual ex-wife and I, like Prog Snob, did rooms and still are here until my place is ready. Taking the other side, I have noticed more negatives in my sleep. I reckon that is due to the situation. I am sure however that she gets better sleep. I was the thrasher and weird noises person, so my guess is her sleep is improved.
With my next relationship, I will heavily consider the options presented here.