I didnt mind either way finding out. I think my biggest reason not to find out is having other people know when i wanted it to be a private secret and people always seem to hear somehow.
DH definately DID NOT want to know and so it was too hard for one to know and one not to so we didnt find out.
We have fun though with the ultrasounds and play around with that we THINK we can see.
THis is our first so it didnt really matter and we were having neutral colours anyhow regardless of gender in the nursery. Subsequent births... we will see - DH definately doesnt want to know with any of the babies.
FUnny though because our familys all think we do know and wont believe us when we tell them we dont... not at all.....

OMG that's EXACTLY the same as us. My DH sucks at keeping secrets and I didn't want to know. We painted the nursery before I was pregnant (cos we were painting and I had a great idea) and it's mint green. I never had any trouble with calling it her, though I was convinced it was a boy.
My ILs were also convinced and were trying to get us to tell what name we had picked cos they wanted to know first - no way.