Quick Definition: Another level from MLTR2 where the PUA has more than 1 bisexual HB in his harem. However this is accomplished, the result is that the PUA is able to have regular sex with at least 3 girls from the harem.
In observance of the Secret Society, mPUAs have identified certain secrets that enable the player to create a harem of multiple women who are willing to have sex simultaneously in groups of 3 or more.
This would be relatively difficult to do, even for a mPUA. It also relates partially to the PUA’s lifestyle, and characteristics such as location, natural charm, and wealth (access to resources) will help if displayed correctly. Some PUAs have developed a natural sense of picking up bi-sexual women, thereby allowing ^3 to seem more probable.
Source: Fast Seduction