Here is more context from the Douay Rheims:
6 But I speak this by indulgence, not by commandment. 7 For I would that all men were even as myself: but every one hath his proper gift from God; one after this manner, and another after that. 8 But I say to the unmarried, and to the widows: It is good for them if they so continue, even as I. 9 But if they do not contain themselves, let them marry. For it is better to marry than to be burnt.
In other words, marriage is good, being single for the service of the Church is better but if you can’t handle the discipline of celibacy because you are “aflame with passion” (for a woman) then St. Paul is not recommending celibacy for such men.
Verse 8 is the “proof text” verse for womens religious orders.