The context was left out for brevity. But here it is so that you can see that it is the SAME context and subject.
9 But if they cannot contain, let them marry: for it is better to marry than to burn. (this is not a command to marry, but a solution offered)
If they can contain, stay single is better. They asked him for his opinion and he told them. if they cannot contain then let them marry problem solved, what is not an option is sexual sin. Contain or Marry. Contain is better.
Then in 35 he is still talking about the very same thing...
35 And this I speak for your own profit; not that I may cast a snare upon you, but for that which is comely, and that ye may attend upon the Lord without distraction.
36 But if any man think that he behaveth himself uncomely toward his virgin, if she pass the flower of her age, and need so require, let him do what he will, he sinneth not: let them marry.
.. Let them marry in the above context does not mean he is commanding them to marry but again offering the solution to "behaveth himself uncomely" Pauls answer is still "behave yourself in a comely manner and attend upon the Lord without distraction, or .. marry, but if you do marry you have not sinned. Do not think you let the Lord down and are less of a Christian because you did not have the gift to stay single and behave yourself.
I do not see anything in the text of 1 Cor 7 that says that Paul said that MOST Spirit Filled Christians will have a problem containing themselves. I think that is our own ideas about our own realities or our perceptions based on our friends or life experiences.
I am fully persuaded that MOST Christians can experience complete control over these natural desires and that they can become irrelevant to their current mission and calling. Now some will not.. and so let them marry. They do not sin if they marry. They have not failed their calling.