Now we have instinctive sex vs non-instinctive sex that must be learned somewhere. I mean, it was already mentioned by a man earlier about sex toy sites making recommendations and some of them do have guides, but I thought, as was discussed on the ASDA thread the other day, that sex and masturbaton was generally something people have figured out on their own and with each other for millenia without need for instructions.
I'm now reminded of when I was 10 or so and asked my mother how gay men have sex and she gave me what I what I now know was a parental 'I do not want to have this conversation off the cuff right now' look and asked if I really wanted her to answer that. Even in very Evangelical America, I was able to put things together and figure out butt sex and that some men must like things up the butt so I could save her the grief with a "No thanks, I think I figured it out".
I'm not sure if that's instinct or what, but I think most adults can figure it out without any porn or person and I'm well aware of at least one guy who almost ending up in the previously mentioned A&E situation trying it out as a young teenager.
Also, there are also a lot of sex books easily available and have been for ages, I have an old Men's Health guide to sex. I really don't get jumping to porn and prostituted people. People have been trying out all sorts of things for sexual pleasure for probably longer than we've been people. Whether or not the OP wants to engage in it or discuss it is up to her (though I would not recommend just putting a finger up the bum without conversation - or gloves and lube), but it's not some really out there newfangled depravity, really.