To be honest, I don't know Zinda well enough. I mean, to me she reads as though she'd be a lot more amenable to mixing sex and teamwork, and that's what I based my opinion on. I don't recall Zinda ever showing sexual interest in females before, but given the subtext there being all about Hal bagging two hot chicks, I thought the lack of previously shown interest in women would go without saying. So that's why my argument concerning Helena was about the team aspect - and not as in 'playing for the other'.
That said, if Gail thinks Zinda would never do it with Helena specifically, I'd love to know why.