Not sure whether the OP is asking if the SP enjoys the punt in terms of orgasm, or enjoys the company.
Many SPs get turned on, if they are in the mood, right client, etc. Whether they orgasm or not is another matter. In my experience, you have got to know a girl very well to truly know if she has orgasmed. Some are very good indeed at faking it, that you genuinely believe it - for the first couple of times.
Most good SPs will claim to have enjoyed their time with you. Let's face it, if they told clients what they truly thought, they wouldn't get much return custom!
The only way to know if an SP truly likes you is if she gives her time or services for free.