Often I pick a scene from a favorite erotic story I read or wrote.
Depends upon the mood! Sometimes I masturbate being the opposite gender and 1) seducing a guy, 2) seducing a girl from the porn I watch, and sometimes being my gender and 1) 'm all over a guy, and 2) being a perfect gentleman and seducing a girl.
It mostly depends upon the personality that resides in me.