Isn't it true -

Your kids are your sperm grown old.
And you will use terms like, "friend" and terms which you won't think in terms of someone of a sperm size.

And what if

http://m.npr.org/story/140476716?url=/2011/09/17/140476716/a-new-openness-for-donor-kids-about-their-biology

(Above article) turns out to be the case.