Whilst I agree with many things you say throughout your piece, I think the overarching point you are attempting to make is flawed.
You claim that sex can be about either reproduction, pleasure or social dominance. I am in agreement with you here, though I would say there are far more reasons that one would seek out sex.
The problem is, if for some people sex is about pleasure or social dominance, there are many other ways of achieving these goals. So, for their life choices to be rooted in sex is a rather selective conclusion.
A man who's drive is conceived through a quest to attain social dominance could potentially have no interest in sex at all. His motivations may stem from a desire to be the CEO of a huge company, a police officer or any other leader or position of authority.
I will not argue that many such types may also supplement their desires through sexual endeavors, but I don't believe that this is the same for everyone.
It certainly sounds as though you have thought this through in great depth, and perhaps it is true that self-reflection has led you to understand your own choices to be ultimately rooted in sex, but to say what you have said, with the level of assurance that you exhibit, is somewhat arrogant.
I mean not to offend, but we cannot simply project our own characteristics onto the rest of the world in order to make us feel less out of place.
I know that I personally am not motivated by sex. I may have been for along time, like many others. But in recent years, I view sex and relationships as nothing more than a distraction that keeps me from doing what I want to do.
I know I am not entirely alone in this philosophy, and I fail to see how thinking of sex as an obstacle to achieving your goals, can really be about getting sex.
One other thing I would add, is that I have said for a long time that if I were ever to raise a child, it would be an orphan who needs a family. I care not about continuing on my bloodline, and many ex's I have discussed this with have felt similarly. Why conceive a child into a world it may not want to be a part of, when there are already children in the world, who need help?
I think it is beyond narcissistic to bring a child into this world simply because you want more of you in it.
It is clear that you are intelligent, and you could be using that intelligence to help others. Instead, you seem to have opted to use it to skew lesser-minded people's understandings of themselves, to better accept your own.
You should not presume to be entitled to speak for everyone. If this was more of a theory or a thought experiment, then I apologise for what I have said. But, it does not read like an opinion, and your comments on this thread seem to support my feelings that you truly believe what you're saying, or at least hope that others will.