After Kate was kidnapped by the Others, she was told to wash up, put on a summer dress, and meet Ben on the beach for wine and a light meal. It was at this meeting that Ben looked to charm, seduce and use Kate.
We think that Ben's first purpose was to find a new ally in Kate. He knew her background. In some ways, they were compatible: they both had father issues, broken homes, issues with authority, the need to control, highly manipulative and willing to play dirty. Many believe that this beach meeting was an awkward attempt by nerdy Ben to make a pass at Kate. In order for Ben to rule his kingdom, he needed a queen. His last attempt, his try with Juliet, ended in failure. A failure so bitter that Ben sent Juliet's lover, Goodwin, on a dangerous spy mission which would eventually lead to his death. Ben showed Juliet Goodwin's grave and cursed "you are mine." However, the only thing that came from that was an uneasy truce.
With Kate, he could literally find a new partner-in-crime. Ben possessed the one thing that Kate wanted: freedom and the lack of accountability for her actions. Ben could manipulate events in such a fashion where those dreams could come true (and perhaps he did during the O6 arc where Kate basically got no punishment for any of her crimes).
We don't know the full extent of the beach meeting, the proposed deals or what the final response was between the two parties. It seemed that Ben was rejected, and Kate thrown in an uncomfortable choice. She had feelings for Jack (who knew and kept her secrets) but was attracted to the bad boy, Sawyer. When Ben found out about her magnetic connection with Sawyer, he pounced - - - basically pitting Jack and Sawyer in a deadly love triangle.
Ben needed Jack's surgical skills to operate on his tumor. He knew that Jack would not cooperate with him. He tried to lure Jack into cooperation by having Juliet get a professional friendship started between them, then push it towards a pseudo relationship. Ben knew from the beginning that Juliet would play along with the game while at the same time try to double cross Ben. Ben wanted Juliet and Jack to bond so he can control them as a couple. If Jack fell for Juliet, Ben had the leverage to make Jack do his bidding.
Ben made Kate make a choice of who would live and die between her potential lovers. Would she choose Jack, who represented her future, or Sawyer, who represented her past?
Looks and actions can be deceiving; when Kate returned to the Bear Cages after rebuffing Ben's advances, she looked at the forlorn Sawyer in a new light. She must have realized that Ben knew Jack was more valuable to the Others than an independent troublemaker in Sawyer. Perhaps her true feelings swelled up inside her. Maybe it was a small spark of human kindness. But Kate did something she would not have done in the past without some reward - - - climbed into Sawyer's cage and made love to him.
It was a passionate, wanton display of lust that was captured by the security monitors for Jack to see.
This also fit into Ben's grand scheme - - - for if Jack had any romantic feelings for Kate, they were shattered by her shagging his obstructionist rival.
But was Kate's fling with Sawyer true love or pity sex for a condemned soul?
Afterward, Kate and Sawyer were put on a work gang building the runway. Jack began to get closer with Juliet in a way to plot against Ben. So in one respect, Ben's plan was coming together. He had separated the castaways into two groups so they would not work together. He put Juliet and Jack into one joint venture against him; something that he knew about and could out flank.
But Kate's relationship with Sawyer never went any deeper to full, complete romantic love.
In the cages on Hydra Island, Pickett asked Kate if she loves Sawyer and she responds that she does. After the camp split, Kate went back to the Barracks for a little while, and she and Sawyer spent the night together. As Jack, Sayid, Hurley, Sawyer, and Kate leave the island on the chopper, Sawyer whispered something in Kate's ear, to her confusion. He kisses her and jumps off the chopper and into the ocean.
Prior to the Oceanic 6's return to the island, Sawyer tells Horace that he had a "thing for this girl once", but after three years, can barely remember her face. However, upon seeing Kate, he is awash with nostalgia, but it is short-lived as he reminds a worried Juliet that "nothing's changed", and that he's with her [Juliet]. After a young Ben gets shot by Sayid, Kate and Sawyer attempt to save his life by bringing Ben to the Others.
After Juliet's death, Sawyer leaves the main group, choosing to go at it alone. Kate, worried for his well-being, follows him back to the Barracks. She apologizes for Juliet's death, and starts to blame herself for the death by returning to the island.
Kate and Sawyer appear to be star-crossed lovers by their own choice. When Sawyer winds up back on shore after the helicopter escape, he drinks with Juliet on the beach. When the world goes strange (flash back in time), Sawyer becomes closer to Juliet than he ever did with Kate. So was Sawyer merely using Kate as a companion, or did he ever have true feelings for her. We could assume he did because he sacrificed himself to save her (in the helicopter).
So why did they not complete their romantic bond when both of them left the island in Frank's Ajira plane? Sawyer had lost his Juliet. Kate had lost her Jack. Both had lost their "spouses" after living with them for some time. Kate's relationship with O6 Jack fell a part before they returned to the island. Sawyer's love for Juliet was cruelly taken away from him - - - and he blamed Jack.
We don't believe Sawyer and Kate got together in the post-island mainland since they did not wind up with each other in the Sideways afterlife. So what was the Bear cage sex supposed to represent? Animal instincts? Fear released as passion? A way to make an terrible situation bearable?
One would have thought that the shared island experience, the good and the bad, would have made Sawyer and Kate a close couple in the mainland. They could have lived together happily ever after since their pre-815 personal baggage had been resolved on the island, for good and ill.
When rules of law and order breaks down, humans tend to fall back to their primitive survival modes. They tend to get selfish, self-centered and looking for instant gratification since the rules do not apply anymore. The island was a test ground for the animal tendencies of man when society's rules are suspended and there is little to no responsibility for one's actions. Kate and Sawyer thrived on that aspect of the island. So why could they have not found happiness together post-island?
One explanation would be that Kate never cared for Sawyer. That her "deal" with Ben was to become Sawyer's lover to control him. Kate would be the "double agent" that Ben needed in order to get inside the 815 camp and isolate its power-leaders. Kate stayed with Sawyer for a short time in order to get something she wanted - - - freedom and escape from the island. But Ben would not grant (or could not it seems due to Jacob's candidate power) Kate her freedom while the 815ers posed a threat to his dictatorship. So if you believe Kate was just acting with Sawyer in order to con him into submission, well played Kate. But in the heat of conflict, danger and near death experience - - - we think that Kate really did have true feelings for Sawyer, and his shelter puppy dog looks, to give Kate's heart a jolt of compassion and passion.
For unwritten in her back story is one of abuse. If it was sexual in nature, it could show why Kate's attitude towards sex was more for the manipulation of men than finding romance and stability in her life. She fled Florida when she felt her husband would find out about her past. She fled the island instead of going after Sawyer after he jumped from the helicopter. She got rid of Jack after she got a wrist slap from the court system in the O6 story arc. She never saw men as being a necessary part of her being. She never connected a physical relationship with love, but with power or self-preservation. So Kate's animal instinct for survival difficult situations encompassed much of her relationships with the men in her life. So much so that it clouded her feelings and ability to find and nurture true love.
Kate's passion for Sawyer was real, but it was lost. It may have been the first time that she took charge of her sexual desires and threw herself on a man she thought would be soon dead. She may have thought Sawyer was the one chance for survival and escape. But Kate never saw far enough ahead in a traditional viewpoint of marriage, home and family to have the bond that true soul mates find in their relationships.
Likewise, Sawyer had no basis for truly caring about any woman. His entire pattern was to love them and leave them. He feared stability because that meant he would lose his freedom. It would cramp his style. He could no longer run wild. He would be trapped in his old man's life - - - a dreadful, suicidal life. So Sawyer consciously kept all the women in his life at bay. He would use them, then throw them away. He needed to be constantly in motion, like a shark in the ocean. It was only when he was trapped with Juliet that he found some comfort in a "normal" relationship in a "normal" home life. At that point, Sawyer believed that he would never return to his past. The 1970s Dharma was going to be his life, forever. And Juliet was the best part of it.
How three years with Juliet changed Sawyer to the extent that he was a new man is not out of the question. Animal instincts can be tamed by the right woman and under the right circumstances. In Kate's situation, she also had a three year window of normalcy with Jack and Aaron - - - the suburban housewife, that she would learn to abhor. So it is possible that deep down, in the same comfortable situations of a classic American home life, Sawyer and Kate would not have been compatible.
So the Bear Cage may have been just what it seemed: instinctive animal passion brought upon by the stressful circumstances of captivity, danger and possibility of impending death.
