Is it true that the vagina becomes larger after the IUD? In recent years, there has been widespread concern about the impact of vaginal rings on the vagina. Some people believe that vaginal rings can cause vaginal relaxation or even enlargement of the vagina. Is this a rumor? The following is an explanation of the impact of the upper ring on the vagina. The structure and changes of the vagina. The vagina is a part of the female reproductive system. Its main function is to allow the male penis to enter the female body and allow sperm to enter the body during sexual intercourse.