a "good" female passenger on a motorcycle is hard to find....aka one that knows not to fidget around & can lean w/ you in the turns
most girls don't have a clue as to how much the rider &/or passenger's body movement affect the directionality of a motorcycle
took this one girl riding once......half-way into a nice sweeping left-hand turn, she decides to pop her head up over my right shoulder & magically the bike starts to go right

.....she got all pissed off at me saying i couldn't control the bike. never took her stupid ass riding again