Bisexual Threesome (MMF)

So, I was looking at one of my favorite porn sites when I decided to check out bisexual threesomes.  Most were pretty good. Unfortunately, I was disappointed by some some of the bi mmf that I saw.  It seemed like the guys were into eachother but the girl, not so much.  I wonder if they are really having gay sex with a girl thrown in for good measure.  The guys looked hot I have to say, but I wanted bi not gay.  I have seen straight mmf that was good.  I have seen bi ffm that looked good.  Why is the bi mmf such a mixed bag?

Dear porn producers,

Can the bi mmf please look like bi mmf?  I know this isn’t too much to ask.  I know that there are bi guys that are into women (obviously).  I have had one on one sex with a bi guy or two and I really enjoyed it.