The vast majority of AVNs produced today seem to be made with one of two image rendering options: Illusion Software products (Honey Select and derivatives), or DAZ Studio. This means there are two common 'looks' for such works. They are either anime-flavored, somewhat cartoonish imagery of the Japanese 'sex simulator' software, or the more realistically oriented approach of the Daz Productions products.
My own work falls firmly in the latter category (even when I'm portraying elves and fairies they're designed to look like real creatures) but I never liked Daz Studio. I still don't. I've tried the newer versions now and then, and I still don't like working with it. I've been using Poser for years and years, and was comfortable with it well before Daz Studio became free in 2012. I started with Poser 5, around 2004.
It didn't matter for a long time, anyway. The go-to figure for use in Poser was Daz's Victoria (originally known as Millie — the Millennium Woman, made by Zygote before they became the Digital Art Zone) which went through several generations. It remained true through the Millennium figures fourth generation, with Victoria 4 (and Michael 4 for the male).
In 2011, Daz Productions changed direction. Daz Studio was reworked to use proprietary file types instead of the text-based markup language it had previously shared with Poser, and they released the Genesis line of figures. Workarounds were required to make Genesis work in Poser, so I kept using Vicky 4, but started looking for alternatives, as well. Later, there weren't even workarounds. Genesis became useless to me.
Victoria 4 has been obsolete for a long time now, and she was replaced in my work by Project Evolution One X — the full-anatomy adult-only variant of the figure. The standard PE:One does not have functional genitalia, but does have a 'young' morph for child characters. About three-quarters of the female characters in my AVNs are based on PE:One X. She was produced by an independent content creator known as Erogenesis (who also made the TAB male genital figure I use for some male characters).
About two years ago, Poser Software introduced La Femme 2 (and L'Homme 2). I'd been using the original La Femme for some secondary characters — she doesn't have fully modeled genitals, limiting her use in sex scenes considerably — and L'Homme was already my go-to male figure, having replaced Michael 4 in that role.
The Goddesses in Double Goddess are examples of characters based on Poser's own figures; the Lover is La Femme and the Mother is La Femme 2. (Sam's human form is another La Femme 2, as well. She has an add-on morph for genitals...)
I'll be taking a deeper dive into the advantages and disadvantages of these, and other figures — I have rather a large collection after more than 20 years as a hobbyist in the field! — in the subscribers-only zone.
My three core female figures are pictured "out-of-the-box", with their default skin and eye colors. Diver City takes work!
Be seeing you.