Board Thread:Questions and Answers/@comment-3444885-20160302152955/@comment-3444885-20160420222330

Pappers wrote: If I was gonna question any character's sexuality in the Metal Gear series, I wouldn't be pointing my finger at Ocelot. No, no - frankly, I'd put my money on Kaz. There's nothing platonic about completing the 'Date with Kaz' with an S-rank. Wasn't Kaz already confirmed to have been attracted to Big Boss (the exact words were "infatuation")? Paz said that in one of her tapes in GZ.

It could be argued that "that's not what she meant", like most things, but infatuation is almost strictly used to describe romantic feelings and the writing/translatation team was surely aware of that.