Agents are not allowed to steer clients in any way--not to certain areas and not only to homes where the listing agent is offering a fee (which will have to be advertised off the MLS)--the exception would be in a situation where the buyer instructs the agent to only show homes where the agent will earn a fee from the seller. Generally speaking, your agent should show you any home that you wish to view and the Buyer Broker Employment Agreement will outline how your agent will be paid.