https://www.psypost.org/2022/05/women-more-likely-to-engage-in-risky-sexual-behaviors-with-more-attractive-partners-63157

Many men are given a hard time for being upset when they learn their SO did things sexually for previous partners but won’t do those same things for them. I’ve been a firm believer that in most of those cases the women are less attracted to the current partner sexually. I understand that in some of those scenarios the person tried something and didn’t like it, but in general I think this is a good barometer to evaluate the attraction level a women has for you.

If she gave the A OK before but you get the NO it’s likely you are being settled for.