do female plants smell more????

[stinkyattic]

Are females more bushy and stronger odour??

Females stink more.
Given males and females of the same strain, males are frequently taller and have longer internodal distances, so as to better drop pollen onto receptive females.

can cuttings change sex????

Well yes and no... a cutting cannot entirely change sex, but it can be forced to grow opposite sex organs; that is, to hermie, under certain types of stress.

Do male plants have shorter pistels?

Male plants have no pistils at all. Instead, they have little flowers that produce only pollen.