I agree. Many girls told me they liked giving me BBBJs because they enjoyed watching me squirm and wiggle as they 'tortured' me with their bj skills. And furthermore girls who allow me to CIM and continue to suck my shrinking dick really enjoy 'killing' me as the intense pleasure/pain that comes right after cumming makes me almost want to push them off my dick or at least beg for them to stop.
I think girls are secret sadists.
But if a guy doesnt react much and just lays there like a girl being served by his slave, then girls won't continuing with the bjs because no girl likes feeling she is being taken for granted and cheap.