I think it's a confluence of innate traits and the demands of circumstance.  I have a love of new experience and adventure.  That often finds expression in travel but also in exploration of anything that makes me curious.  I also have a strong sex drive.  That is the innate part.  The circumstance part comes in the need for discretion and lack of attachment.  While I could attempt to satisfy my sex drive and indulge my love of adventure through casual relationships (MLTR's), the lack of discretion and attachment that can come with those is not compatible with my lifestyle.  The hobby satisfies that requirement.  Most recently, I visited Goldentime FKK in Vienna and found in it the sweet spot of the confluence that I have described.

For myself, I'd have to agree on the innate traits combined with circumstances theory!  Once I finally (in college) disposed of the concept of someday being a virgin bride (yay!) I felt immediately "at home" in my very naturally sensual/erotic self.  As my relationships developed, fell apart, changed etc I eventually realized that even the "bride" part held little appeal when I could have so much fun AND not be tied down!  
I also don't think that it is only the "sexless (traditional) relationship" that makes one have the very natural desire for a life of variety!

So...here we are! Yay!

XO
Wendy

For me it's a combination of therapy and being willing to act on my purported intellectual convictions.

That the word WHORE actually means "beloved one"....that's was the very first meaning og the word.
Thank you all for calling me a whore!! I'm so BELOVED!! We all are!

I entered the hobby because after 20+ years together my wife was affected with a mental illness that left her unable to love and left our marriage virtually without sex.  I spent some 5-6 years dealing with her biannual sex desire and constantly having my advances denied before giving up and joining the hobby.  I had felt that the hobby was better, not really cheating because I was paying for a service my wife did not want to fill not having an emotional affair.

After a few years of enjoying just the sexual aspect, it became difficult not to enjoy the emotional side of the hobby for me.  The really good providers offered the affection that also had been lacking in my life, yes there are some really talented GFEs in town.  I know it's temporary and limited to the time purchased but it can feel real, briefly giving me something that I haven't felt for years.  So now the hobby is an affair, supplying both the sexual and emotional needs lacking in my life.  This has allowed me my needs while not abandoning my wife.

This is why I say born, learned and forced.  We are born with the need to seek our sexual partners and sometimes, through circumstances, pushed to enter the hobby.

In my younger days I would have never seen an escort.  But after my marriage fell apart, I decided I had no interest in being celibate until if and when I found another SO.  Took a while for me to get the hang of things but I have been having a wonderful time for some years now.

For me absolutely born this way. Born so effing HORNY that my mind is in constant fantasy mode. And I still haven't learned how to turn it off. Okay, really not trying so hard either.  

What was his name?

I enjoy sex, and fun uninhibited women. "The Hobby" allows me to do that, and meet women I would never meet under normal everyday circumstances. And I don't find it morally wrong as long as both parties are consensual adults. Oh, and yeah - BOOBIES!!! Love those...