How come women tend to prioritize and value the opinions of other women when considering going out with a man, rather than trusting their own judgment?

because they're weak.

the rest of the group's opinions matter more than their own opinions.

this is how they are........ take advantage of it.

I heard/read that if you ask a woman out on a date, if she tells her girlfriend about your meeting, then if her girlfriend doesn't like you and opposes the date, it's unlikely that she will go. How true is that?

Yes and no

Certainly the badboy rep can work in your favour.... but you want her friends to say you're dangerous and a bad influence and likely to fuck and dump her....... rather than creepy or unattractive.

never happened to me.

all the girls I've dated, their friends don't like me and say I have "red flags".

If they like you enough they will ignore their friends. If they listened to their friends and leave you, then it's just them wanting validation, the decision has already been made

It's because in olden times, when the men were away something something, and the women were something something else, sabre tooth tigers, and giant manmoths something something. So obviously, something something was very important for survival something.

Women don't want to be perceived as sluts, they deeply know for every guy they fuck, they are losing value. Yet they can't help it, when an attractive guy with proper game show up, they just can't resist. They are in a runaway train and they can sense themselves inevitably crash into your bed and there is nothing they can do about it.

That's when they use friends as the people who will shield them against bad decisions.

Women are conformists. They are very status conscious. If a man brings approval and status elevation, he is great, if not, he is rubbish.

Its not usually as much about you and your character as you would wish. Much is about what you are perceived to bring.

Thanks for the comments, but I'm not sure you understand how I phrased it.

I would like to know if this phenomenon really exists, or if this thing only happens to girls with bad attachment styles, or is there any basis for this statement at all?