From the perspective of the elderly, girls in discos must be bad girls or girls who don't study well. From the perspective of young people, it can be said to be fashionable and exciting. Contact between men and women, to rub, to find excitement.
On the other hand, most of them are single or girls who can't study well and go there to eat, drink or ask for money. I don't think girls who are experiencing life or family background will go.
I can only advise you to stay away from such people, so as not to delay yourself and waste your time and youth.
Personal suggestions are for reference only. I hope my answer can help you. Thank you! ! !