absolutely anywhere...there's nothing hotter that a chick with tattoos.its kinda like my kryptonite. I could fall head over heels for a girl I like( with tattoos) . my ex had tattoo on the wrist. she had an angle nailed to the cross.
a tattoo on the back would be very nice. I wouldn't let anyone choose your tattoo cos it is for life so get what you think is the best design for you. whatever you get, I am sure its gonna be awesome cos you have the style to pull it off. =)
I like tattoo's on the woman's back. Not lower back, but on the center close to your blades. I think its definitely sexy. Also, having a tattoo there will allow you to hide it when you don't want to reveal your tattoo.