Girls can be difficult

You misread the situation obviously. It's not that hard to tell if she wants one or not and these are two different women. If the first woman said, "why didn't you fuck me?" Would you have fucked the second? No.

Girls aren't difficult if you acknowledge they're all completely different people and that there is no hive mind deciding "what girls want" or "what girls like." Sorry, no cheat code or blanket thought process. You gotta start from scratch with each one.