First, what is hot babe? It is an app that shows a girl on your desktop. The more stress your cpu has, the less clothes hot babe has on.
First install hot babe:

sudo apt-get install hot-babe

Now start it via the menu, or via hot-babe.
(Note, if your girlfriend sneaks in, you can always close her with a right click).

Now, try to get her undressing. It will not go so easily. But here are 2 methods:
(just copy and paste them in a terminal)

openssl speed

john -test
(maybe you need to apt-get install john)

If you want to get her undressed in a sec, and make your PC as slow as hell, do the following:

wget http://raymii.org/cms/content/downloads/hot-babe.sh && chmod 755 ./hot-babe.sh
./hot-babe.sh

(The script just calls a hell of a lot openssl speeds...)

Now, does your hot babe undress? :P