I appreciate that sex and entertainment spreads a broad spectrum and like many things in life, an "Each to their own" approach is a useful tool for accepting some of the "kinks" of life.  

I recently (and actually laughed-out-loud) became aware of a series of sex movies called "Smell my fingers"!!!  The male has sex with the female whilst sticking his fingers in her arse, then shoves them under her nose!!!  Isn't that just charming!  That's a funny title for a movie!

I can't help but wonder "Why are these movies made?"  Where does this fall?  Kinky or comedy? Do people watch this to get turned by imagining\remembering what stinky fingers smell like?  Or do they just find it funny?
How hygenic is this practice?
Also, what about the "smeller" in these movies?  Do the producers only find people with no sense of smell or those that just don't care?