Albert Barnes on 1 Corinthians 7:1

Now concerning, etc. In reply to your inquiries. The first, it seems, was in regard to the propriety of marriage; that is, whether it was lawful and expedient.

It is good. It is well. It is fit, convenient; or, it is suited to the present circumstances; or, the thing itself is well and expedient in certain circumstances. The apostle did not mean that marriage was unlawful, for he says, Heb 13:4, that "marriage is honourable in all." But he here admits, with one of the parties in Corinth, that it was well and proper, in some circumstances, not to enter into the marriage relation. See @1Co 7:7,8,26,28,31,32.

Not to touch a woman. Not to be connected with her by marriage. Xenophon, (Cyro., b. 1,) uses the same word (απτω, to touch) to denote marriage. Compare Gen 20:4,6, 26:11, Prov 6:29.

(*) "to touch" "Not to take a wife"