I suspect there's some law in the U.S. about mixing BDSM and sex in the same video.
I may be wrong, but I think it is a federal offense in the US, hence the faking it.

Here in Canada, it is extremely difficult to get any BDSM films - we have strict laws against it, and anyway, the Customs people confiscate and watch them for free.

Most bondage movies are pretty lame, but there are some by companies like Twist Productions that are well done. You could check out Devonshire Proiductions, but again - no sex, just lots of bondage.