In many cases it could just be a ploy to make punters think they're not seeing many clients and therefore a lot fresher than WGs that work full time!
As is mentioned many times, never believe them!!
Unless one knows more about the girl, I would be not be inclined to believe her, as this line is usually
used to suggest that she is not a conveyor belt.
Phil, that's what I was trying to say in my original post.
Also, I take it at face value when a WG says she's working PT. One tends to find out more after meeting her once or twice,
and when she's opened up about her personal life.
Ooh, I also used to have a regular PT Girl, who worked as a (lowly paid) hairdresser Wed~Sat, the busy days.
She used to work incalls on Mon and Tues from a hotel in Leicester.