I guess we can only speak from our own personal experiences. My younger sister is adopted - now 22 yrs old! Something we have never hidden, but never made a big deal of either. Infact she is more of a child to my mother than the birth children (another story altogether). There has never been any issues with identity, and from her perspective to date she has expressed no desire to seek her birth parents. If, and when she chooses to, then I am sure we will do all we can to help her in her quest. In our case she recognises that circumstances were such that her birth parents had to make a very difficult decision, and put her forward for adoption. I would imagine that more often than not, it is circumstances that warrant children being put forward for adoption. I am truly sorry you feel that you were unwanted by your birth parents Bugsy. Have you tried to trace them, if only to have your questions answered? Do you feel it would be betraying your loyalty to your parents if you did?
I do not know much about the mechanics of sperm donation, but I agree with you that there should be a system whereby some level of information should be kept as a record e.g. medical history, colour eyes, height etc. It may already be available. Sperm donors should however, IMO retain their right to privacy. Also the off-spring would know their maternal heritage.
Adoption, sperm donation, not something I am against at all, and would happily consider, indeed welcome and embrace. I firmly believe issues regarding identity are not limited to children/adults born into adoption, sperm donation etc. I am of mixed race, and mixed culture and I like that.... but my goodness, for some the persistent questions like 'Who am I?', 'Where do I belong/fit?', and even 'Why should I have to choose?' are other issues that multi - racial / cultural people, regularly face and live with. I don't know if I am being very coherent, but what I am trying to say is that I feel questions regarding knowing, understanding and accepting our identity are not limited to sperm donation, adoption, sexuality etc.
Oh dear WWW, what HAVE you started???