Roster

[Sarah]

A register or roll showing the order in which officers,enlisted men, companies, or regiments are called on to serve.

[Sarah]

list of people in which a person has had sex with

[Sarah]

a roster is a group of girls that can be called on at any time for casual sex, these girls don't know about the roster or each other, to add girls to this group is known as building your roster.

[Sarah]

Your group of friends.