Any time more than two people get together, it is a gang. As long as there is one male banging his cock, it is a gangbang
A threesome, as long as it contains at least one male, could also go into the hardcore category (if a threesome category doesn't exist). If the threesome consists of three females, it goes into the lesbian category. If the threesome consists of three males, then it goes into the gay category.
I believe the orgy usually conists of 5 or more people. After all, there is the foursome
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