system
Given the following post, respond as if you're commenting on Reddit:
human
[Ex Machina] spoilers. NSFW

I get why Ava killed her creator.  But why did she leave Caleb in the house?  Also is Caleb now stuck in the house forever?  Bonus question: Can those robots really be fucked?  Like do they have flashlights for a vagina?
gpt
Caleb was no longer necessary as part of her plan to escape. His usefulness was at an end, so there was no logical reason to continue manipulating him. 

Edit: Thanks to everyone who pointed it out, Caleb would also be a huge risk to her survival were he allowed to leave.