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What is the entire biological evolution of sexuality? (Maturity only)?

If our main purpose on earth is to spread our DNA and engineer offsprings, where does the line between pyschological behavior and primal instincts cross? Sexuality is entirely biological, with almost every known animal species exhibiting some form of heterosexual and homosexual attraction, but how did the human genitalia evolved from the primates? Why did this occur and how is that our brains can be excited by hormonal stimulation? The human male genatalia is larger than any primate whereas the female hips have evolved into a wider arrangement.

Public Comments

1. It shouldn't be said 0_0
2. ya get bored, dont ya know
3. Uh. I can't give answers to your entire question. In fact, I'm not sure I even understand it. For one thing, men do *not* have larger genitalia than any other primate. You are thinking only of the penis. The length may be due to sperm competition. Men have moderately sized testicles compared to other apes. You can answer your questions by going to college and majoring in biology or biological (physical) anthropology. Then you can go to graduate school. Then you can be a post-doc. But you can start off by reading the links below.
4. Well I am busy right now, but I can give you a piece. There are two possibilities I can think of as to why male genatalia would be larger. One would be that ancient females selected mates with larger genetalia and the other would be that smaller genetalia would not ensure proper fertilization and so males with larger genatalia reproduced. Female hips are wider to accomidate the larger heads of newbors because human babies have larger heads to accomidate their brains.
5. In addition to the two answers you've gotten, I'd like to point out that asexual reproduction is not at all uncommon among animals, perhaps not many vertebrates (though there are certainly vertebrates which reproduce parthenogenetically) Natural selection (or sexual selection) has simply favored the traits you have described.