Gallop's not the first one to do this.

I don't know why I know this, but Tony Comstock made "real love, real sex" videos at while at http://www.comstockfilms.com/ . They're intended to be "documentaries that simultaneously explore the vital role of sexual pleasure in committed relationships and the problematic place of explicit sexuality in cinema"

He also has a recent blog post about why he stopped making the films: http://www.tonycomstock.com/2011/09/12/why-i-dont-make-movie...