[E=MC2]

Thus, from the first moment of fusion between sperm and egg, everything necessary to develop the adult human being is present,

This would apply also BEFORE the sperm and egg physically meet. No egg should go unfertilzed. No sperm should be left wanting for his egg.

[Ultra Sonic 007]

Sperm = Who cares?
Ovum = Who cares?
Sperm + Ovum = Developing human being = I care!