It's pure speculation on who actually did because no one can guess what is in someone's mind.
Before someone chimes in and says that so and so said in an interview that they joined because they liked sex blah blah blah, these interview are by porn insiders with pornstars and no one will say "I joined the industry because of my gas bill and the rent was three months late".
I'm not saying none joined because they liked sex I'm just saying they have a vested interest in saying they did.


