Wouldn't it be weird if you shat from your dick and pissed from your arse.
And for girls that don't have dicks, as opposed to ones that do, a good analogy for a dick is a tube of tooth paste. So imagine that attached to the front of you. You'd have to squeeze it out.
Vibrating cosmetics - you might as well give men power tools with fleshlights on them.
(Namely, "Neutrogena Wave DUO Power Cleanser" and "Maybelline Pulse Perfection Vibrating Mascara")
Now a completely unnecessary image: