A nawalt female ("not all women are like that") is some kind of unicorn who unlike all other modern females is not promiscuous. In the red-pill philosophy and the wider manosphere, people came to the conclusion that:

If the woman is not a nawalt you should not marry her.

In fact, this is merely a rediscovery of ancient red-pill knowledge that you can find in religious scriptures, such as in Quran 5:5 (Q55). The women must be chaste. Otherwise, forget about doing anything serious with her. If the bride is not Q55, if she has ever engaged in premarital sex, then there is really no point in trying.

Or is there?

Imagine that all females are now fully promiscuous, with no exception left. So, Imagine that there is not one single Q55 woman left. Does that mean that absolutely all human sexual reproduction will completely fail?

No, there will be exceptions, of which the existence is guaranteed by Carnap's diagonal lemma:

For every property that applies to logic sentences, there exist one or more logic sentences that are true and for which the property is true, or, that are false and for which the property is false.

So, concerning "The woman is promiscuous. The marriage will fail.", there will be one or more woman who is not promiscuous and the marriage will fail anyway, or, who is promiscuous and the marriage will still not fail.

Both are possible, but only one of both has to exist for the diagonal lemma to be satisfied. At the same time, it will not be possible to exclude one of both alternatives completely. That was famously demonstrated in Gödel's second incompleteness theorem.

The existence of Carnap's diagonal lemma guarantees the probabilistic nature of the universe. There do not exist absolute deterministic rules, because that would be a violation of the lemma.

Therefore, if you marry a promiscuous woman, the odds will be heavily stacked against you, but there is still some kind of minimally small likelihood left that the marriage could possibly still succeed. Therefore, if you marry a promiscuous woman, it is not exactly 100% sure that your marriage will fail. There will be cases in which, against all odds, it will still work.