Yes that would be true, especially of the Perez version. Still she's been shown to be attracted to men, even in that version.
Which is hardly incompatible with what I said about her being able to have feelings for a person regardless of gender. Just because she hasn't been shown in a relationship with a woman, that's not evidence that she's incapable of it -- just that the writers of her comics have avoided depicting things that would run afoul of the censorship of the time, just as Marston did. And I have a hard time believing she could've grown up on Themyscira without even experimenting with her fellow Amazons from time to time.
See, you keep trying to reduce this to a choice between absolute categories -- "lesbian," "bi," "prefers men" -- and in so doing you're consistently missing my point. It's that very insistence on defining sexuality in terms of cubbyholes and labels and exclusions that I don't consider to be applicable here. I think Diana would be attracted to
people -- to their souls, their hearts, their character. Whether they were male or female wouldn't be a major issue to her. If the people she's been shown to be interested in have all
happened to be male, that's not inconsistent with that interpretation. A random flip of the coin can have a run of all heads yet still be random; the very nature of randomness is that it rules nothing out. (Walter Bishop argued otherwise on
Fringe last week, but in fact the odds of getting heads 10 flips in a row are only 1 in 1024, unusual but hardly impossible.) My point is simply that I don't think she chooses them primarily
because they're male, that I don't think she would consciously define herself as a person unwilling or unable to be involved with another woman if she met one that she had a special affinity with.
After all, you can't always assume that the people someone actually ends up falling in love with constitute a statistically perfect representation of their preferences, because there are a lot of situational factors involved too, the happenstance of who they actually have opportunities to meet; and of course most people are attracted to more than one single variable in other people. Case in point: In principle, I'm quite fond of, well, Power Girl-esque proportions in women, but nearly all the women I've actually fallen in love with in my life have been small- or medium-chested. Simply by the luck of the draw, the women whose faces, personalities, spirits, etc. have captured my affections the most strongly have not happened to have ample chests.
So by the same token, it's entirely possible that a woman could be perfectly able and willing to enter into intimate relationships with both men and women, but simply hasn't yet met a woman who captures her affections in that way. After all, if she doesn't care about the sex of her partners, she'd have no incentive to actively seek out an equal number of both sexes. She'd just let her heart go where it wanted to go and not care about male/female ratios.