I would e-mail a site to see if it's ok to play their site as well. For example, if you wish to use Casino.net, you will likely be asked to verify your ID's by faxing in copies of your licenses and/or passports, etc. The T&C does state one user per household, so they might tell you no. Some sites vary on how they'll accept this.

However, I think it is ok if you choose one of the other Boss Media sites that your roommate hasn't hit yet. Remember, there are many to choose from. The easiest 4 to clear are Sportingbet, Sportingodds, Total Poker, and Casino.net.