I don't really understand how something "isnt becoming more common than it was in the past" while "being more frequent today [than it was at the beginning of the century] " ?
And who said that it's more frequent today?
You know that archives for one century old porn is absolutely not the same than a whole world wide network full of porn, right? What have been saved mostly come from private collections, and can't fully represent the actual proportion of content, because fully depending on the collector taste; and collectors tend to focus on the aesthetic value more than on the kink.
Plus, there's also a difference between a digital age, where anyone can take his smartphone and publish a porn video online, and the early 1900, where the price for a camera could easily represent a full year salary, and I don't talk about the difficulty to handle it up to more or less the 30's. And, of course, there's the fact that you had to develop the negative all by yourself, few professionals, when they started to exist, would have agreed to works with your porn creations.
This mean that most of the content in the archives come from professionals pornographers; the ancestor of nowadays porn studios. And, with the cost, especially in terms of time, they wouldn't have cared to produce content for an insignificant part of their public.
What I said is that you found it less frequently in the archives, not that it was less frequent.
Due to the difference between 1900 and nowadays, and the difficulty to constitute the said archives, if it was less frequent, you would almost not find a single one example from those times.
I don't think it's a new practice at all, [...]
Of course that it's not something new. The oldest occurrence of pegging I know appear in
Philosophy in the Bedroom, from Sade, published in 1795. And he probably haven't invented the practice out of nowhere. Therefore, while there's no obvious evidences of this, it's expected that it was at least a recurring practice in the Libertine circles of his time.
This while, still to my knowledge, the first occurrence of a strap-on is mentioned in
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trial, late 15th century. To commit the acts of lesbianism she was executed for, she used to use a device strapped to her body.
While she never had sex with a man, the device existed, and libertines hearing about the case, at those times or later, probably seen here an opportunity.