There are a number of PT threads, but I'll mention my first review of pass-through porn here. Granted, I've only had one day with my Quest 3, but I experimented for 1-2 hours with PT porn and overall, it did not meet my expectations, or perhaps it was just too over-hyped. Here's why:
The technology is not there yet, not even close... The problem is, EVEN IF, the pass-through cameras were incredible and as crystal clear as real life, it won't matter. PT porn looks like an obvious 3D projection in my room... It's like I'm playing a video game, but not in a believable way. There is no sense of realism there. I can see the outline of the body, the hair, I can see the pixels and the keyouts... the lighting doesn't match, there are no shadows cast from the performer. The performer is just a projected 3D image in space, and it's very hard to unsee it.
And then, getting them to align to my body after every position, it's a hassle and takes a lot of work and "suspension of belief." With VR, the entire picture is "whole." We are transported to a VR location, and we are there. There are no distractions, no weird glitchy behaviors. VR is much easier to be immersed in. PT takes A LOT OF imagination, which isn't exactly what I'm looking for in a porn experience.
Also, the scale... my oh my, it's so glaringly obvious now at how big or small the models look in PT. IMO, nearly all the new Canon R5C PT scenes on SLR, the women are scaled too small, because when they are in my room, sitting on my desk or on my bed, they look 80% of their actual size. It's very off-putting. In VR, the new Canon R5C scenes look fine in terms of scale. Everything in PT would have to be completely utterly "perfect" for it to be somewhat believable. The scaling (which depends on my room, the objects around me, my IPD), the lighting, the keyouts, the stunt cock location, the alignment... It's just not there yet for something truly immersive.
The best part of PT for me were probably just the intros and stripteases. It's kinda cool to see them walking around and dancing in my room. It doesn't require my body to be aligned, etc. And it's a cool "demo" that I could show my buddies or something. Also, I enjoyed the first part of Britt Blair's SLR PT scene, where she's sitting on a table. Lining that up was entertaining, and for a few brief moments it was believable she was there on my desk. But for a hardcore PT experience... I don't know, it is not at all what I was expecting.
The headset itself is very nice, I don't think it was a waste of money. I will use it for gaming (very excited to play Asgard's Wrath and Lone Echo), and for some fun non-porn AR experiences, and for traveling. Good to have a spare headset around, but for my dedicated VR porn viewings, I will stick to my PC + Pimax 8KX.