Nice Tattoo Oskar, I have tattoos also, they are a personal choice, and we get tattoos etched on our bodies because they have meaning to us.
I too have suffered addiction, (not drug or sex related) but gambling was my down fall.
So I have a tattoo that relates to the evils of gambling and yes there are skulls in it, (its a constant reminder of past events) the other tattoo relates to my oldest brother whom died back in 1991, he was a musician and an artist like me.
He did surrealism art, so I have a woman?s body from her head to her hips crawling out from a tear in my skin, I drew these free hand and had the tattoo's done on my body, my choice, my life.