Woah, awkward topic. Anyway, Iveechan is right. Mating and reproduction is a miracle of life, so technichally, it isn't discusting. Here's my theory.
Most of the animals that breed together are of a similar size (Skitty isn't compatable with a Wailord, jymx. Not in the game) They do it the way, well, to keep it undiscusting for you immature children, they do it the way most animals related to their kind do it. Then, the female lays an egg, and when you come back from the daycare you receive the egg.
Now here's MY question. When you say you don't want the egg and the keepers keep it, what do they do to it?