These are the ways i've found so far.
Use the crow bar to open the vent in the upstairs lounge storage room, you will find some accelernt (lighter fluid); find matches in a sleeping bag (don't get caught), light a fire on the ground floor, sneak up and hide in the vent for a few hours then harass big al when he's sleeping. the guard assumes your a prostitute leaving.
*OR*
keep listening in all locations at different times, you may find enough info to leave
*OR*
The below pipe method (i haven't got this to work yet)
*OR*
Do the above with the matches and get caught and become a sex slave and be rescued in 6 months (Sex involved)
*OR*
Talk to the nice guard 4-5 times and he'll invite you upstairs for a gang bang with the guards.