Should my husband reach out to his adult daughter who was placed for adoption?

My husband gave a child up for adoption as a teenager, over twenty years ago. He is now curious about her and wants to contact her. I think this may cause problems for her that he hasn’t clearly thought about and is blinded by his own curiosity. I know she has reached out to her birth mother in the past. I can’t help but feel that if she wanted to know about her birth father she would have reached out to him as well. I don’t want to be insensitive to my husband. I can’t imagine what it must have been like to give a child up for adoption when you are just a child yourself. I just fear that reaching out to her could cause serious waves for all parties involved, especially her and her adoptive family. Any advice is appreciated.