My purpose for getting my tattoo was to express my creativity about myself and since I often draw, I wanted something that was a reflection of my personality. I also don't follow trends, as trends change daily. I make and follow my own trends.
Of course we shouldn't be judgemental, but as humans we are genetically bred to have certain characteristics that cause us to make decisions based on the physical appearances, levels of intelligence and many other traits. I'm guilty of judging people, but I've also learned that you can't pre-judge someone based on some preconceived notion, sterotype or a personal experience.
As for my shoulder blades tattoo there isn't any sexual connotations behind it like lower back tattoos. I personally put my tattoo there because I didn't want to bring unwarranted attention to myself and only those who I choose to let see my tattoo will see it.