I'm not sure why since DC probably wouldn't allow that...and he's not Chris Claremont who's splashed it around his work. But to elaborate...
...when Morrison talks about her sexuality he's talking about how he understands the character as a symbol and the underlying psychological dynamics that form the subtext of the story. Hence the "Thing was an angry castrated baby" because in a sense Benajim Grimm the character is metaphorically castrated. His rocky form cuts him off from normal human contact and interaction, and has been a source of frustration that keeps him from acting on his desires. You also see it in
All-Star Superman. Tonally it recalls the bizarreness of the stories of the fifties and sixties. He even mentioned the Mort Weisinger era and recognizes there was some disturbed psychology going on in those stories. (And having seen some of them I have to wonder if 60s sexism aside, there also wasn't a fear of women bubbling under the surface.)
Yet in
All-Star Superman he reverses that to present Superman who very obviously has a sexually healthy adult relationship with both Lois Lane and Jimmy Olson. No bizarre tricks, adoption, stories, etc....well except for the reference to all the tricks Superman used to hide his secret identity, but that's party of him opening up to Lois to consummate their relationship instead of playing games. Morrison has said that much of his writing is a metaphor for what's happening in his own life and his writing is very metaphoric about the struggles we face in our own lives. And usually his big bads are just metaphors for the unhealthy or darker aspects of our psychology that come up through repression and not facing them down.
The Invisibles just make it very obvious with the Lovecraftian horrors that attack the characters with their personal failings.
When Morrison talks about the character's psychology he's referring to what
T Hedge Coke pointed out here. He's not talking about writing a porn comic, but the underlying psychological dynamics that writers impress on the Wonder Woman character whether consciously or not. Similarly, based on my reading of his work, Morrison feels that he needs to grapple with Wonder Woman's past portrayals, including Marston's weird sexuality. Namely to resolve it because Morrison's remarks indicate that it's merely been buried and ignored rather than actually worked through to the point where the character can naturally move on.
Whether this is necessary or not is up for debate, but any sexuality he presents is likely going to be sublimated into what will be a very colourful superhero story, much as he sublimated his commentary on the way that woman in superhero comics are vehicles for people's unhealthy sexual fantasies into a standard supervillain mind control trope in
Final Crisis. (And we can debate the success of that too, but the point still stands.)
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