Expecting same day or last minute makes me feel like I'm your Plan B, second choice, or spur of the moment just looking for a hole to fuck and don't care who she is or what she looks like.  Uggggh!

Prebooking assures me that you honestly want to see me because you are turned on by me and my body type and there won't be any stupid unflattering review showing up later on that says, "Well she wasn't my body type but I just needed to get off."  

Now if you are a regular, that is the exception to the above rule.