Two people reproduced 7 billion people.

[John V]

Possibly, they didn't, and we had several generations of inbred progenitors until enough variation resulted for it not to be an issue anymore. Inbreeding is not ideal, but it doesn't make propagation impossible.

Actually I was going to bring that point up myself but wanted to do a little research first (which I still haven't done). In-breeding could be a non-issue for both sides.

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The first creatures to develop sexual reproduction were not as complex as a human being. The more basic the organism, the less there is to fuck up.

I could say that the fewer components to fuck up, the more vital each component is. You need to prove this point.

There's no proof that I am aware of... yet... See, that's the joy of science, it keeps advancing and incorporating new information as it becomes available. Perhaps the origins of sexual reproduction will never become available, as we are likely talking of microscopic forms of life that existed millions of years ago.

I don't have a problem with believing something without proof. That was Esquilax IIRC.

It's still better than your theory that two perfect people populated the world.

Your opinion is noted.

Seems like a probable link to me... organisms that can reproduce both sexually and asexually as needed, handy. Sexual reproduction is great for diversity. Asexual reproduction is better for population numbers.
http://en.wikipedia.org/wiki/Reproduction

Sometimes people try to go through this route to get from asexual to sexual, but it doesn't work. As you note, such creatures are better off than creatures who only reproduce sexually, so their would be no advantage to them in losing the asexual component.