I have to fullheartedly agree wiht Lulu. Having father unknown is a terrible thing to see on a birth cerficate.
eg
one of my besties eldest and her boyfriend spanked the monkey, split and found out later that she was pg. She knew who it was but still put father un known on DS' birth certificate. Then her and boyfriend patched things up and ended up getting married.....having 2 more children with fathers name on all certificates. Friends eldest son discovered his birth certificate and was an emotional wreak cause he thought his dad wasnt his dad and that he didnt love him. HE then had to 'adopted' his own son.

It might not be easier now as you put it...but why not but up with the crap now when there are no children envolved rather then hurt their souls later in life.