Discussion: Are people who participate in group sex bisexual?

Reading the article at the attached link is recommended to understand the explanation.

Group sex manifests particular sexual behavior which is not necessarily related to sexual orientation. Bisexuals are attracted to members of both sexes. Bisexuals are mistakenly perceived as "sexually promiscuous" but not necessarily partners in group sex.

Link: The Unified Energetic Model of Sexual Identities and Orientations. (Alixin's theory)
https://www.sf-healing.com/page/169 (Copy & Paste)