i figured out how, it seems you unlock the option on day 50.
your bot have to love you very much, then go to sleep, there will be a scene where you invite your bot to sleep together
There is an option in the pc --> bot console where you can see the bot's lust and sympathy.
At what number should it be minimum to get the bot to bed. I'm at day 56 and still didn't unlock it.... :(
You can unlock it in day thirty you just have to spend laod of time iwth her like going out side and constantly fucking her
