Well, now that I HAVE read the whole thread, I'll say what I always seem to say, which is that humans are subjective creatures. Therefore anything in our common experience is still highly individualized, including appetites.
Some people are incredibly passionate about food or wine; their level of expertise in all things culinary is awe-inspiring. I love food and wine, but not like THEY love it.
Sex is pretty much the same as far as varying levels of interest. Some of us really do have little to no appetite for it, and there's nothing whatsoever wrong with that. On the other hand, some of us really do have absolutely VORACIOUS appetite, and there's nothing wrong with that either.
Where I find things to be - not 'wrong', exactly, but more unhealthy - is where guilt is in the mix somehow. For very sexual people, guilt is likely to come into play where our desires outstrip those of our partners, if we are not well-matched in that regard. For asexual people, social pressure can make them feel guilty or 'weird' for their lack of desire. For still other virgins, guilt [or fear thereof] is the *reason* they are virgins, and to me that is not a choice, it's the result of manipulation/ pressure from religion or family or restrictive ideas of morality.
Speaking personally, I prefer not to think overlong on how I lost my virginity, since it was not by choice and I was only 11.
In spite of that traumatic experience, I am sexually almost insatiable, and enjoyed a great sampling before settling down with my husband. In contrast, despite the fact that his appetite matches mine (and sometimes exceeds it), he was extremely conservative in taking lovers before we met. This, I believe, was partly cultural, since he grew up in Japan with relatively strict, Japanese old-fashioned values about sex.
He and I lived very different lives before we met, though we are approximately matched in appetite; neither of us has regrets (and he is a very fast, adept learner, thank the gods
).
However, now that he has a wife, he finds it much more difficult to go without sex than he ever did when abstinence was his norm. On that basis (and similar accounts from others), I do think sexual appetite can lie dormant in submission to the will, only waking on command. (Although you might have to be extremely stubborn for that, judging by my spouse
)
To sum up, I think the best answer to the thread title's question is, 'Why not?' Sexual choices - to have, or not to have - require no justification, as long as they are made by consenting adults.