The reason why girls go to the bathroom in pairs is for social reasons as well as safety and practical reasons.
Girls going to the bathroom in pairs and together is a way for the girls to feel more secure, especially in crowded and unfamiliar places and it also provides the girls an opportunity for conversation, bonding and gossip.
In public spaces such as a public restroom, having friends nearby can offer the girls a sense of protection and make them feel less vulnerable.
And it can also be reassuring to know someone is waiting outside or is nearby if assistance is needed or if there is an emergency.
This is particularly true in possible unsafe environments or during late hours.
The bathroom or restroom can also be a space for gossip, sharing personal thoughts and feelings and private conversations.
And it's also a chance for the girls to check and fix their appearances together and share makeup or hair tips.
And bathroom or restroom breaks can also be a way to step away from the main group and regroup, strengthening friendships and creating shared experiences.
Going to the restroom or bathroom together can also be a way of avoiding leaving someone out of the conversation, as it's easier to chat when everyone is together.
Also friends can help with carrying of the girls bags or purses and they can also assist with clothing adjustments or makeup and having a companion can also make waiting in line less tedious and make the experience less awkward.