Dave, deciding to stay single is not a sin, period. You take my statements out of context. If someone "needs" marriage, then he/she has a dependency of someone, somewhere, meeting that need. Feel free to freak out about the word "weakness," but just consider that statement as a sound one.
I made that mention because a lot of people complain about their needs not being met in marriage, including whether or not they can even find a partner.
But why do I have to repeat myself like this, Dave? Could you notice the context of my statements before getting after semantics and arguing needlessly?
1 Corinthians 7
Now as to the matters of which you wrote me. It is well [and by that I mean advantageous, expedient, profitable, and wholesome] for a man not to touch a woman [to cohabit with her] but to remain unmarried.
What happens when you read this?
2 But because of the temptation to impurity and to avoid immorality, let each [man] have his own wife and let each [woman] have her own husband.
3 The husband should give to his wife her conjugal rights (goodwill, kindness, and what is due her as his wife), and likewise the wife to her husband.
4 For the wife does not have [exclusive] authority and control over her own body, but the husband [has his rights]; likewise also the husband does not have [exclusive] authority and control over his body, but the wife [has her rights].
5 Do not refuse and deprive and defraud each other [of your due marital rights], except perhaps by mutual consent for a time, so that you may devote yourselves unhindered to prayer. But afterwards resume marital relations, lest Satan tempt you [to sin] through your lack of restraint of sexual desire.
6 But I am saying this more as a matter of permission and concession, not as a command or regulation.
So what, now, Dave, you want to make marriage a command and regulation?
7 I wish that all men were like I myself am [in this matter of self-control]. But each has his own special gift from God, one of this kind and one of another.
You made a big deal about singleness being some outrageously extraordinary gift and I'd personally grant that it may be more rare than the gift of marriage. However, they are both gifts. Paul does not put an emphasis on one of them being on some higher order of spiritual rarity here like you are trying to mislead.
Paul has the gift of singleness and says he wishes everyone else did, too. But you want to make marriage an imperative?
So also then, he [the father] who gives his virgin (his daughter) in marriage does well, and he [the father] who does not give [her] in marriage does better.
Paul illustrates a CHOICE for singleness, and one that he thinks is "better."
I cannot believe someone is actually trying to argue about this.
1 Corinthians 7:18
But if you do marry, you have not sinned, and if a betrothed woman marries, she has not sinned. Yet those who marry will have worldly troubles, and I would spare you that.
This has the notion of CHOOSING to marry written all over it, Dave. Paul considered singleness the better OPTION, granting that not everyone would be able to choose that. But the advantage of staying single is avoiding worldly troubles.
There is no need to add confusion to this. There is just not. Anyone should be able to walk through 1 Corinthians 7 without having its statements reinforced and repeated.