There are several forms of hobbyists in my opinion. Those who just want to get off and those who want that but want the fantasy of what could have been or what could be. The very best providers give that illusion of a connection. It is not fake in most cases, they just have a better ability to connect to human beings, thus you feel a connection.
This happens in real business as well, where you make a connection with the owner on a better level than another similar business. Ari provides that sense of girlfriend of what could be.
Think about it. For many people there is this never ending sense of wanting to know what life could be or could have been if different choices were made. This applies to the choice of woman and for woman, men. In this hobby I would imagine that for some woman they run into some decent guys, stable, educated etc.. that may be on different level than what they are normally attracted to in real life. There is an attraction to that. For some men the provider represents a more sexual creature, not maybe what they were used to dating or married to, and this fantasy carries over to what could have been.
At the end of the day some guys would put their dick in a knot hole of tree if they can get off and others want more. What provides stability in raising kids, simplicity void of drama and a simple life also leaves for a fantasy of non stop sex, a wild child and woman that gets into you (at least for an hour)
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That is why this profession has existed since time. What one partner can provide in many areas, they often time simply can't provide in others.