1. Friendship: Girls and boys may be good friends and may want to spend happy time together. Swimming is a good activity choice.
2. Health and exercise: Swimming is a good exercise and fitness activity. Girls may want to keep healthy and exercise by swimming.
3.*** Same interests: Both girls and boys may be interested in swimming, and they may want to share this interest and hobby together.
4. Dating or romantic relationship: If a girl is emotionally interested in a boy, she may want to express her feelings by inviting him to swim.
Whatever the reason, swimming dating is a good opportunity for girls and boys to get to know each other better and establish a closer relationship.