Boys dig girls' private parts, and then girls have stomachaches. Why?

Hello, it may be caused by improper exertion by men, poor hygiene or pain caused by inflammatory infection in women. You need to rest for 2~3 days, and you can apply it with a hot water bag. If/kloc-0 gets better after 2 days, it should be considered that it is caused by improper force, and attention should be paid in the later stage. If it doesn't get better or even worse, you need to go to the hospital for gynecological B-ultrasound.