There's one or two scenes on DSoT where there's an implication of "improper sexual relations".

1) Comfy Numb solo gets an approving nod from Rachel

2) Run Like Hell, there's a somewhat suggestive exchange of smiles

I think that's where the rumour comes from. Either way...I'm bloody jealous of BDG.

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Only the very safe,
Can talk about wrong and right.
Of those that are forced to choose,
There's some who will choose to fight.