Here's clips of the lovely Nina Hartley in the reverse cowgirl position:
http://www.youramateursex.net/data/interracial/blacksoncougars/660/blacksoncougars_saaas.html
http://www.youramateursex.net/data/interracial/blacksoncougars/661/blacksoncougars_saaas.html
http://www.youramateursex.net/data/interracial/blacksoncougars/662/blacksoncougars_saaas.html
http://www.youramateursex.net/data/interracial/blacksoncougars/663/blacksoncougars_saaas.html
Enjoy!
Rep, please