[muleskinner]

If killing an adult human is immoral, killing an embryo is immoral. They are both human, in different stages of development.

See 321. SO you would agree we must not kill any sperm, as well.

[Lunatic Fringe]

Correct. A human sperm cell has human DNA, it is alive, and if allowed to proceed in its natural function would produce a baby.

Protect the sacred life of the sperm!

[dirtboy]

SO you would agree we must not kill any sperm, as well.

A sperm is not fully and genetically human. It will not develop into a human of its own accord in the womb (except in Woody Allen movies).

[Forgiven_Sinner]

Me: "If killing an adult human is immoral, killing an embryo is immoral. They are both human, in different stages of development."

muleskinner: "See 321. SO you would agree we must not kill any sperm, as well."

No. Sperm has 1/2 the human chromosones. It cannot grow into a human being itself. It is part of a human, but it is not human.

At conception the 23 chromosones of sperm join with the 23 of the egg and a human life starts.

Why do you think the stage of development affects the species? Or the morality of killing a human?