What are some philosophical reasons not to commit suicide?

Sociobiology teaches that a certain set of egotistical, selfish values remain with us from antiquity and will continue to be cavemen. Certainly the insanity of this Second Great Depression seems to confirm the selfish war of all against war that hides behind the facade of law, civilization and morality. Society today accepts the idea of an evil human nature it is often used as the argument of why communism wont work. That human beings are greedy sex hungry monstrosities. That each individual is worse than a Stalin.

How can the infinite pains of life be justified in comparison to the calm serenity of nonexistence? Has any man in history lived a life so blessed as to outweigh the pleasures of endless dreamless sleep? Is not man's greatest sin to have been born? What duty is there to continue to live? We did not choose to be born.

Why pass on genes, and sentence another generation to hell for the selfish pleasure of sexual desire?

Schopenhauer said we were in the worst of all possible worlds. If any worst it could not exist as mass suicide would follow. Instead an irrational will to live which we could not control forces us to go on with our wretched lives until we commit the sin of parenthood and sentence another generation to the hell of existance. Sex is the tool the WIll uses to ensure the survival of this hell. Sociobiology like Eo Wilson, Dawkin's Selfish Gene or Riley's The Red Queen all agree that a brutal rapist sexuality is at the root of "human nature".

So if there is no rational reason for living, and if one rejects the values of sociobiology and the times, then what is the philosophical argument against suicide?