Delete some of them to open more room OR upgrade to Premium Access and it opens up to 1000 messages.
This thread will help
http://eccie.net/showthread.php?t=24105
• Expanded Private Messaging Capacity - Premium Access members have a much larger Private Messaging capacity, enabling them to create folders and save important messages to/from providers, other members, or staff. With a message capacity upgraded from 50 (registered users) to 1000 (premium access), you may organize your messages and maintain an archive with little need to delete messages to leave room for new incoming messages.
In addition to
• The Rest of the Story - Premium Access members may view all content posted within the Rest of the Story (ROS) portion of reviews. This area typically contains a far more detailed account of what took place during the session reviewed. Members often find the information contained in these sections very useful in their search.
• Men's Lounge - Premium Access members may post and view all content posted in the hidden "Men's Lounge" forums. These additional forums are rich in content, and only viewable to our Male members. Each Metro location across the US has it's own Men's Lounge, and Premium Access enables you access to all of them nationwide.
• Private Posts - Premium Access members also have custom BB Code capability which enables them to restrict viewership of any of their postings to other Premium Access (male) members only. This is useful when replying to remarks that were made within the hidden part of reviews, a hidden forum, another post marked private, or any other scenario in which you do not want your remarks viewable by the general public.