Lots of valid points above.
As for "review specials" imho only you can set your rate. But you could consider making an introductory special of say 1.5 hours for your normal rate (many guys cannot last an hour anyway) .... and you can also post ads in cities nearby to Houston, like Austin or San Antonio, inviting folks there who visit Houston to consider visiting with you during their travel.
As for the hate mail, since you are using gmail, it is very **easy** (I do this all the time) to set up multiple filters and in each filter (either subject or body, but not both) insert one of the words that are frequently in the hate mail. Set the filter to cause the incoming mail to skip the inbox and go straight to delete. Yes, you may have to set up a dozen filters or more, but once set up, not much will get through.
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If you are planning travel to Austin or San Antonio, consider attending a meet and greet (I guarantee you'll be invited) at the start of your stay; I know some guyz and galz will enjoy meeting you.
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gmail **filters** - in the upper right hand corner of your gmail home page is the setting wheel. Click the drop down arrow and click on settings, choose the "filters" from the links across the top of the page, and then scroll to bottom of page and click on "create new filter." After you fill in a blank or two, scroll to click on create filter with this search and then follow through.
None of the mail will actually be deleted; it ends up in your trash file, and you can always check that periodically.