that seems quite logical to me. might this also be the reason why there are more men around than women?

Genius are people who devote all their attention to solving some mind blowing problem, often at the expense of the everyday reality around them. This behaviour is far more typical of men than women. Simple as that, without even knowing any thing about it at dna lavel. It also frequently results in insanity, or at least eccentricity, something which most people don't find desirable.

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might this also be the reason why there are more men around than women

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Is that so? I grew up in a region that had more women than men. Certainly, men are more likely to die young than women, even in times of peace (and women live longer). Women get the strongest survival genes.

well, exactly what i thought. but as we see, species such as virii with a high mutation rate are highly successfull...

This isn't really relevant, but I just wanted to say, "i'm posting from my Wii." ...Sweet!

This concept of non sexual reproduction
(bacteria, some simple see lifeforms etc)
just works for really small lifeforms, that can reproduce very fast with little energy.

For higher liferforms/more complex, the twin sex reproduction is the most benefitting one.

Actually, Damocles, it's not just some simple lifeforms that can reproduce without intercourse. For instance, female komodo dragons (largest lizards in the world) are able to reproduce by self-fertilization.
Check out this news story.

Reptiles can change sex, but this is just a short term strategy.
(probably to be able to survive with just one female, who cant find a mate)
In the long run, it is required to combine 2 genoms from 2 differnt animals.
Else, the probability for unwanted mutations grows to big, wich is more severe
for large, slow reproducing lifeforms than for bacterias.

Also plants can reproduce with seperated plant parts, but
soon or later, a 2 sex reproduction must take place.

Changing sex is something different than self-fertilization I think. This is a nice example and good proof that sort of a dualism of sex isn't always needed for reproduction and eventually the survival of a species. (at least for 1 generation, I did hear several professors state that a healthy population should consist of about 200 genetically more or less different individuals, otherwise the population would be doomed eventually)

Cheers