I am somewhat a fan of such material and find Japanese bisexual videos to be very interesting. I have done considerable research on this topic and I'll have to respectfully disagree with some statements made in this thread so far. First, bisexual (MMF) JAV is rare, but it does exist and it is produced by major companies. The material I have seen mostly came either from Japanese Gay Video (JGV) producers or from gay video divisions of JAV companies. I recall seeing material from Coat, Hunk Channel, Japan Pictures / Glossmen (JGV companies) and from New Sexual (gay division of Soft On Demand). It appears to be only a very small percentage of the material that they produce.
See this link for some examples:
http://gayasianporn.biz/tag/bisexual/
There are also a handful of videos on sites such as Pornhub, including a personal favorite there titled "Orgy Of Straight" (
ノンケの乱交). I had read a story that the cast was from members of a baseball team that made the video as a fundraiser for the team (literally 'taking one for the team'). Coat also has a small bisex series called "G.G.G." (Gay x Guy x Girl) with a few volumes.
I have done extensive searching for such material with only very limited results. Most of the material I've found was produced from the early 2000's to present and the production appears to have been sporadic. Coat Corporation has a straight video series called "AV" (Another Version). Within this series, they have several straight orgy videos, many with the phrase "Super Promiscuous" in the title. These often include light play between the male actors, but it is usually limited to kissing or brief sucking before the straight action gets into full swing. I've always felt this series had tremendous wasted potential, being so close to an all out bisexual orgy, but switching to exclusively straight action after initial bi contact.
There is a particular JAV actress with an armband tattoo on her left arm that appears in several of the bisexual JAV videos that I have seen. I am still trying to identify her by name in an effort to locate more of her work.
I have discussed the topic with some fans from Japan and was basically told that bisexuality is very rare there, and so the market for bisex videos was very limited. In response to this limited market, it appears that production companies have produced only limited material. I was also told that people in Japan are basically either gay or straight, with very litttle in between. Transexual videos are somewhat popular, but they are considered to be a subset of gay videos. My personal observations are a bit different in that I do encounter a considerable number of fans that desire Japanese bisexual material. I also observe very many japanese porn fans (in Japan) that identify themselves as bisexual.
In my opinion, this is a fairly large unfulfilled market. I believe there is considerable demand for the product and the JAV companies do a very good job when they decide to produce it. Hopefully, they will realize that there is a very substantial desire for such material and increase production in the future.
If anyone can direct to a source of such material, please advise. JAV is certainly produced for much smaller and more obscure niche markets, so it is rather surprising that this more mainstream genre goes largely ignored. I myself am not bisexual, however, the models and the action in these videos are so hot that it does tend to 'pique my curiousity'. ;-)