Have been with DP for 3.5 years, living together for 1.5. I'm 26, he's a couple of years older and we have no children.
He is my best friend and I don't know what I would do without him. We're a great team, communicate well, have the occassional small tiff if one of us is overtired (or I'm hormonal) but 99.9% of the time have a wonderful loving relationship. We are very affectionate with each other and hug and cuddle and kiss each other a lot.
I am definitely attracted to my DP, but I hardly ever want to have sex. It's not personal though- I don't really want to have sex with anyone. Sex hardly enters my mind at all, whereas it used to be all I could think about!
When we do have sex, maybe once a week or every other week on average, I do really enjoy it once we get into it but never have the urge to initiate. It's like I almost have to psych myself up to do it. I know once a week probably doesn't sound that bad, but as we're still fairly young and don't have any children yet I feel like we should be doing it more.
Before we got together, I went through a bit of an 'experimental' phase for a couple of years having previously been in a couple of long term relationships. It was fun while it lasted, and I really enjoyed sex at this point in my life.
DP and I both lead independent and full lives. I have quite an emotionally demanding job and have recently taken up an old hobby which I am spending a lot of time practicing. When I think about sex it's almost as if it's just at the bottom of my lost of priorities- I'd rather have a good night's sleep 
I've been on the pill, and came off it about 8 months ago and wondered if my sex drive would come back....It hasn't.
Sorry this is so long...not sure what the question is really. Just wondering if anyone else has had something similar, looking for some reassurance I suppose!