By separating the function of adaptation from the function of maintaining the integrity of individual genes, sex allows much greater diversity while still keeping genes whole. Sex is not only fun, it is good engineering practice.
Yes, genes are important for understanding our behavior. Incredibly important - after all, they code for every protein pertinent to brain function, endocrinology, etc., etc. But the regulation of genes is often more interesting than the genes themselves, and it's the environment that regulates genes.
In your thirties, you're much more comfortable with sex. First of all, sex is something you've done more. You know you can have sex just to have sex; you can have sex with friends; you can have sex with people you love; you can have sex with people you don't like, but the sex is good. And you can joke about sex much more.
The sale of sex in modern societies is not about spreading genes. Sex has been taken over by the memes.
We know cancer is caused ultimately via a link between the environment and genes. There are genes inside cells that tell cells to grow and the same genes tell cells to stop growing. When you deregulate these genes, you unleash cancer. Now, what disrupts these genes? Mutations.
New synonyms for sex: Going to a family function, getting the hard part over with, anti-fillet. Get it? Sex!
The regulation of genes is often more interesting than the genes themselves, and it's the environment that regulates genes.
Junk turns the user into a plant. Plants do not feel pain since pain has no function in a stationary organism. Junk is a pain killer. A plant has no libido in the human or animal sense. Junk replaces the sex drive. Seeding is the sex of the plant and the function of opium is to delay seeding. Perhaps the intense discomfort of withdrawal is the transition from plant back to animal, from a painless, sexless, timeless state back to sex and pain and time, from death back to life.
Because of the relationship between programmed cell death and human disease, the identification of the genes and proteins that function in the process of programmed cell death has provided new targets for possible intervention in a broad diversity of disorders.
Cheetah genes cooperate with cheetah genes but not with camel genes, and vice versa. This is not because cheetah genes, even in the most poetic sense, see any virtue in the preservation of the cheetah species. They are not working to save the cheetah from extinction like some molecular World Wildlife Fund.
In any complex organism, brain formation and function must be controlled in part by genes.
Growth is kinda built into everyone's genes. It's built into management's genes, the salesman's genes, the investors' desires. People expect companies to grow.
Sex is hard to write about because you lose the universal and succumb to the particular. We all have our different favorites. Good sex is impossible to write about. Lawrence and Updike have given it their all, and the result is still uneasy and unsure. It may be that good sex is something fiction just can't do - like dreams. Most of the sex in my novels is absolutely disastrous. Sex can be funny, but not very sexy.
If you had a daily printout from the brain of an average twenty-four-year-old male, it would probably go like this: sex, need coffee, sex, traffic, sex, sex, what an asshole, sex, ham sandwich, sex, sex, etc
Complex organisms cannot be construed as the sum of their genes, nor do genes alone build particular items of anatomy or behavior by themselves. Most genes influence several aspects of anatomy and behavior as they operate through complex interactions with other genes and their products, and with environmental factors both within and outside the developing organism. We fall into a deep error, not just a harmful oversimplification, when we speak of genes "for" particular items of anatomy or behavior.
Human beings function better if they are deceived by their genes into thinking that there is a disinterested objective morality binding upon them, which all should obey.
It's a very complex network of genes making products which go into the nucleus and turn on other genes. And, in fact, you find a continuing network of processes going on in a very complex way by which genes are subject to these continual adjustments, as you might say - the computer programmer deciding which genes ultimately will work.