My point was that group sex exists. It is a part of the life of many adults, many more than a lot of people would think, and so long as it is consentual between all parties involved it isn't my place to label it ''wrong''.
Consent is the key factor at play. Gang bangs are not gang rapes, group sex isn't group rape, that much should be obvious and was clearly stated in the post you quoted.
Is she consenting to engage in sexual acts with those six other people too?
If she is, then it's her right, no matter what or how strongly opposed my opinion about it would be. If she isn't, then they would obviously be rapists if they ignored her lack of consent and forced/coerced her into having sex with them.