Which is the actual baby: the sperm, or the egg?

Is it a sperm cell that eventually grows into a human baby, or is it the ovum that is, in essence, a baby that isn't yet born? I.E.: When a man masturbates, is he killing off just sperm cells, or is he actually killing off POTENTIAL HUMAN BABIES? Please, no smartass remarks about how dumb a question this... show more Is it a sperm cell that eventually grows into a human baby, or is it the ovum that is, in essence, a baby that isn't yet born?

I.E.: When a man masturbates, is he killing off just sperm cells, or is he actually killing off POTENTIAL HUMAN BABIES?

Please, no smartass remarks about how dumb a question this is - if I wasn't serious about it, I wouldn't ask.
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