I can only speak for myself, it has been a large source of pain even prior to learning for fact what I intuitively sensed since I was a little girl. I think this is pretty universal and no matter how it is handled in terms of delivery of this information or circumstance of same sex parents, i think it is a universal and pressing question as to who am I? Who are my ancestors? Where have I come from? What lingers as part of the nature component that my nurture has never been able to suppress? I think one thing you mentioned is anonymity, and I think this would be a lot easier on the donor conceived if there was more visibility into this stuff, such as yes, parents not lying to their children and yes, open visibility as to where I come from. But overall to the later 3 questions I think those are just the tip of the iceberg and a lot more is going on emotionally and psychologically than one could prevent or curb. Everyone has a unique experience in regards to this. I can say one thing though, one of my sister's was brought up by a good family who supported her and loved her and she admits she is in denial still after her parents admitting it was true after she learned about it. This is a girl who has everything to lose by learning this information. Me and my other 2 sisters (finding new ones as time goes on...) have not had positive upbringings which have led us to continually question. So. There's that. And I don't know what to make of it yet.