do keepers get free sex?

All the male keepers I've chat with tells me they never try the MMs from their own garages. They insist that its something they never do because its not good for business. I've heard otherwize from MMs. Some MMs tell me that their keepers try to get free sex from them while others are willing to pay. I tend to believe the MMs because I think as a horny male stuck with sexy girls all day, I don't think I can hold it in either. Also, how can the keepers know what their MM's service is like if they didn't give them a trial session? What do you guys think?