Not to stir the pot, but I’ve seen discussed on here the idea that fornicating with contraception isn’t any worse of a sin than fornicating without contraception (fornicating here meaning sex outside of marriage). This is not to make light of fornication (people always seem to get the wrong idea, as if this somehow makes fornicating okay). It’s just that contraception has been explained as not making the fornication any worse. Contraception as discussed in the CCC 2331 - 2400 only refers to the use of contraception between spouses.
You cannot use this and say “contraception is acceptable when fornicating” because fornication is itself unacceptable.
I am not advocating this point of view, but I’ve seen it and it came to mind when I read this topic. I welcome clarification.