I'm not sure if there is a nationwide cross registry or if you get the equivalent of a social security number for your sperm, but if not, you probably should. You never know whose path you're going to cross. This being said, you should just be able to say (if you hook up with someone else who was conceived the same way) "my dad was sperm #45263633", compare and contrast, and leave it at that.
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It is all 33girl's fault. ~DrPhil
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