Totally agree with idea of random malfunctions. She's a device, and a prototype at that. She's going to have problems. Entire side quests to figure out a way to fix her would be great gameplay.
Additionally the bot should wear out, right? I don't care how well she can lubricate, there's still friction. The bots equivalent of a Labia minora, mouth lips, and fascia around the anus are eventually going to wear out. Sorry anon, no blowjobs or going outside until you replace her "camolips."
(and likewise, there could be personal injury to Anon... Sure you fucked the Bot until you passed out from exhaustion, but now your dick looks like hamburger...)