Why doesn't my girlfriend live in the dormitory every physiological period and come to the house I rent for a week?
Because the girl will feel more secure, he can't be scared for seven days or he will lose too much blood. She needs to find a safe place in these seven days, and the physiological period of girls is the most secure these days. Even if you two share the same bed, you can't do anything for her. She just wants to test you!