easysocial profil for couple

Hello,
is it possible to have a profil for a couple with some common information and some personal information
ie. birthday for the man and birthday for the lady
height and weight is also common information.

Most of the fields like height and weight I don't have issue creating a field for each. but what about unique field like birthday, which I cannot use it twice.

Can you tell me how to do it for keeping the best of easy social.

thanks