The girl learns to be used by, or please, multiple sex partners successively over a prolonged continuous period. Generally, this class must include 3 others besides the girl. The lesson must be conducted by at least two male Dominants (Teachers or Masters) and may be supplemented by female Dommes, and other slaves (male or female). The girl is to be used orally, vaginally, or anally - sequentially or simultaneously - for a minumum of 60 minutes. She should accept the cum of all male participants inside her in that time. Lesson may be from another room with at least 1 Tenured Teacher present, that will grade.