I tried the Glory hole

A boyfriend ask his girlfriend to have sex with his best friend in order to help make her into a slut, she goes ahead and does it so that she can make him happy. However, after she has sex with his best friend she realizes there is more to this then meets the eye, as she decides to try other things out in terms of sex with other men, and tries out something called a glory hole at a local adult bookstore. Does she enjoy it? Will she do it again, and is there more to why he wanted her to have sex with his best friend, as well as why does he want her to become a slut?