Interesting breakdown of the movies and how the writer believes the slashiness was largely responsible for the success of the series.
I don't necessarily agree with everything, I thought Tokyo Drift was pretty slashy myself and that Four was virtually replacing Letty with Brian as Dom's love interest and that in Five, Brian knocked Mia up as an afterthought between spending all his time staring adoringly at her brother, but it's still an interesting read.
http://nextprojection.com/2013/04/09/the-fast-and-the-closeted-how-hollywoods-most-homoerotic-franchise-put-it-in-neutral/