[spoiler]Idgie’s tomboyish nature is certainly covered in the movie, but her sexuality is largely ignored, aside from her refusing to marry Grady and not ever showing much of an interest in any men.
In the book, there is a character, Eva, who is, among other things, a prostitute that hangs out at the bar down by the river. Idgie’s older brother, Buddy, has “relations” with Eva before his tragic death at a young age. Idgie has “relations” with Eva after Ruth gets married and moves away to live with her husband. Those “relations” go on and off for about 5 years. Then Stump, Ruth’s son, who is raised as Idgie and Ruth’s son (see below) is taken to Eva, by Idgie, to gain confidence in “what to do with a girl” when he comes of age.
Here are a few quotes I’ve been able to scrounge up:
…“Good God, girl, whats the matter with you? You look like a lizard with a hangover!”
Hank Williams was singing his heart out about how he was so lonesome he could die.
Idgie said, “Rugh moved out.”
Eva’s mood changed, “What?”
“Moved out. Went over to Cleo and Ninny’s house.”
Eva sat down. “Well, good Lord, Idgie, why did she do that?”
“She’s mad at me.”
“I figured that. But what did you do?”
“I lied to her.”
“Uh-oh. What did you say?”
“I told her I was going to Atlanta to see my Sister Leona and John.”
“Didn’t you go?”
“No.”
“Where did you go?”
“Out in the woods.”
“With who?”
“By myself. I just wanted to be by myself, that’s all.”
“Why didn’t you tell her?”
“I don’t know. I guess I just kinda got mad at having to tell somebody where I am all the time. I don’t know. I was beginning to feel kinda trapped, like I needed to get out for a while. So I lied. That’s all. What’s the big deal? Grady lies to Gladys, and Jack lies to Mozell.”
“Yeah, but now, honey, you ain’t Grady or Jack…and Ruth ain’t Gladys or Mozell, either. Oh Lord, girl, I hate to see this happen, don’t you remember the fits you was having until she came over here?”
“Yeah, but sometimes I just need to take off for a while. I feel like I need my freedom. You know.”
“Course I know, Idgie, but you got to look at this thing from her point of view. That girl give up everything she had to come over here. She left her hometown and all her friends she creu up with–gave up all that just to be here and make a life for you. You and Stump are all she has. You’ve got all your friends and your family…”
“Yeah, well, sometimes I think they like her better than they like me.”
“You listen, Idgie, I’m gonna tell you something. Don’t you think she couldn’t have anybody that she wanted around here? All she’d have to do is snap her fingers. So I’d think long and hard before I’d go flying off.”
…
(Whistle Stop, Alabama’s Weekly Bulletin) October 30, 1947: Stump Threadgoode Makes Good - Stump Threadgoode, son of Idgie Threadgoode and Ruth Jamison, got a big write-up in the Birmingham News. Congratulations. We’re all mighty proud of him, but don’t go in the cafe unless you’re willing to spend an hour having Idgie tell you all about the game. Never saw a prouder parent.
…
[Smokey] had never touched [Ruth], except to shake her hand. He had never held or kissed her, but he had been true to her alone. He would have killed for her. She was the kind of woman you could kill for; the thought of anything or anybody hurting her made him sick to his stomach.
…
And even after she had died, she was still alive in his heart. She could never die for him. Funny. All those years, and she had never known. Idgie knew, but never said anything. She wasn’t the kind to make you feel ashamed of loving, but she knew.
She had tried so hard to find him when Ruth had become ill, but he had been off somewhere, riding the rails. When he did come back, Idgie took him to the place. They each understood what the other was feeling. It was as if, from then on, the two of them mourned together. Not that they ever talked about it. The ones that hurt the most always say the least.
…[/spoiler]