What if your child or hers needs a donation of tissue to cure a disease? (bone marrow for example) wouldn't you want to assist a child in need? Confidentiality need not be compromised. The donor or a member of her family might be assisted as well. After all without her help you may not have a family. I added a clause to my contract as follows:
The Donor also agrees to consider assisting the child or children if a serious medical condition could be improved or cured with a donation from a genetic relative. The Intended Mother agrees to do the same for the Donor or the Donors children if they are diagnosed with a serious medical condition. The Parties shall mutually determine at that time whether any increased contact is warranted.