Compared to some fetishes I've just read here, mine are really nothing
I've got a few of them, some are basic to the point I don't know if it is technically a fetish. Others are a bit more uncommon.
The most basic: big boobs. Well, I'd say this is still a fetish. All my JAV collection is based on big boobed girls, with some exceptions. Aoyama Nana, Julia, Yoshikawa Aimi, Okita Anri, Sayuki Kanno, Hitomi, Saki Okuda are a few names that can't be missing in my cast. But there are many girls with "medium size" boobs that I also really appreciate, like Sakura Kokomi, Hamasaki Mao, Hayashi Yuna. Actually, I like "juicy" boobs. Flat chested girls don't do much for me, at least when watching JAV. Recently, I've been enjoying a girl who is kinda skinny and has small boobs, but she' got something that really turns me on: Shirosaki Aoi. She has a pretty damn sexy body, nice ass and a very cute face.
Another fetish, I think this is not so common or not widely appreciated by many: female ejaculation/shiofuki. I wonder if people who enjoy JAV are also into shiofuki, this seems to be more common in japanese porn than in western. I remember I showed a video from Cytherea to a friend of mine, he was disgusted and I was "What, you don't like it?!?". I absolutely love it. I first found out about female ejaculation when I was into western porn, with Cytherea and such but nowadays I don't watch western porn at all. Unfortunately, I think that most of the shiofuki scenes are fake and girls are actually just peeing. They probably drink lots of water before the scene and then fake some spams while letting it gush out. But I don't know, actually I'd like to hear your opinions as well about this. Satou Haruki, Hamasaki Mao are the squirters that come into my mind now. Otsuka Saki seems to be the japanese Cytherea, but she doesn't squirt in all her movies and there are only a few of them with really good squirting action (if they are not fake).
Recently I've been into lactating/breast milk JAV. It makes me extremely aroused, I'd love to taste it. But it's harder to find good movies, because I'm a bit pickier about this one. Just breast milk is not enough, the girl has to be hot/pretty. I mean, watching an ugly fat lady with a horrible body lactate won't do much for me. The only actress that I'm enjoying with this fetish is Kasuga Mona. She had super big tits that could easily gush milk, it's amazing. Sometimes, her tits would drop milk even when they were not being squeezed. Now her tits got very saggy and I don't think she can lactate anymore. There's this girl called Omori Haruka who can lactate and did a really good movie (OMGZ-096), but it's more gravure/softcore than porn. If you guys have suggestions of hot/pretty JAV actresses that can lactate, I'd be happy to hear about them.
My last fetish makes me think. In JAV, I'd say that it's not a fetish at all, but in western porn it's definitely the exception: hairy pussies. It's been some time since I watched a western porn movie, but back then, when I still was into it, shaved girls were the absolutely majority and I'd say it didn't change much (or it did?). But in japanese, non-shaved girls seem to be the rule. Although I've been watching JAV for quite a few years, only recently started to really notice and enjoy the hairy pussies. Also, I enjoy hairy pussies, but not hairy armpit, legs or body in general. This is interesting: at least from what I can see, japanese girls don't really have super hairy pussies, even when they don't shave. By not shaving, they get a nice bush but not an exaggerated one. Actually, I'm enjoying some thicker bushes. Like Okuda Saki. What a fine bush! Thick and beautiful. I'd love to play with that hair! Also Hamasaki Mao has a nice bush, she never shaves it seems. The other day I saw a Yoshikawa Aimi movie in which she also had some nice bush, not thick but long threads of hair sticking out that I really enjoyed. Mine Nayuka is another who comes to my mind, she usually performs in her movies with her pussy hair long and pretty. Also, I'd love to hear suggestions from you guys of hot/pretty JAV girls with a nice thick bush down there.
Edit: to illustrate what I mean: