My favourite bondage (very sadistic) videos of all time are:

ElitePain - Life in the Elite Club - Part 1 (female bullwhipped during a horse style training by sexy female)

Cruel Amazons - Ms Larissa, Lost Race (pretty female in horse riding gear whips map across back and chest)

Cruel Amazons - Swishing Whip (oiled up male slave tied up in factory and whipped severely by a pretty female until bleeding)

Mood pictures - The Maid (female tied between whipping posts and bullwhipped in a military style punishment)

Mood pictures - South Pal (female tied between whipping posts and bullwhipped in a military style punishment)

Dom Boss - Claiming of orchid / whipping of john (male slaves back/ass bullwhipped 200+ times until bleeding by many females)

My favourte porn sites are:

http://thepornobest.com/

http://www.brdteengal.com

http://www.tiava.com

http://www.teenmpegs.com/home.html