It doesn't have to be. Some people roleplay it as a party-girl agent who can finally use her promiscuity for her work. Some people roleplay it as a high buttoned girls descent into craziness.
But it
can be, so the fact you
can play it another way is completely irrelevant. Nobody would be forcing you to play a lesbian if the option was added. Also, it's made perfectly clear that even the
sluttiest agent will be doing things outside her comfort zone, there's a big difference between being promiscuous and being a nymphomaniac. (Hypersexual disorder is a DSM-V condition and is
not a good thing, and developing it is likely to be one possible result of the stress of the mission on our agent if she can't keep on top of it.)
I think there are many games where you already have rape fantasies or non-con fantasies fulfilled. This is one of the few games I have found where you have a female lead who can still have some agency and strength beyond generic bimbofication. All women who have played this game that I have spoken to appreciate this option, even if they do not use it.
I think you're taking this far more negatively than it really is. Neither I, nor anyone else, have said
anything about changing the fact that the agent
chooses to go on the mission, and I
certainly never said anything about 'rape fantasies'. I said that the story of a lesbian agent choosing to go undercover like this for the greater good would be a powerful one. Whether you're playing a slutty agent who is used to the wild life or a tough agent who will do what she needs to, none of this is non-consensual and a gay agent wouldn't be any different.
Beyond that, it would make little sense in the in-game world. The main character undergoes detailed questioning throughout her career- including her past relationships. I highly doubt a lesbian woman would be chosen for this job, no matter how great the rest of her skillset is, simply because there would be a level of discomfort she'd never be able to overcome, which would put her at risk even more than she already is.
Questioning of past relationships is standard for
all intelligence agents, it has nothing to do with the mission.