Thanks to the information from Jin, I am finding out how ever single 'M' rated videogame on the Nintendo 64 has sold:
Bio F.R.E.A.K.S. May, 1998 - No information available.
Carmageddon 64 Jul, 2000 - No information avilable, recieved 1's and 0's for a review from most online websites.
Chef's Luv Shack Dec, 1999 - No information on this game found anywhere.
Daikatana 64 Nov, 2000 -
http://ign64.ign.com/articles/082/082933p1.html The game was only released for renting.
CBFD -
http://ign64.ign.com/articles/093/093211p1.html Declared by Nintendo a 'flop.' Sold 13,000 units on the week after it was released.
Pefect Dark: Was the second best selling game of May 2000 and has sold over 1 million copies.
Doom 64: Game sales were below average to poor. The game upset several hardcore Doom fans.
I'll add on to this list when I get the time.