1. What kind of design? A sexy girl tattoo should be something erotic, exotic, and even a little dangerous looking. What you should not get is something "cute", like a rose or some common type of girl tattoo. The design that stands out is going to be strong and sexy. You can still bring femininity into your tattoo by adding other elements around it. For instance a dragon tattoo on a female can be very sexy, while you can then add in surrounding stars or small flowers to accentuate feminine qualities, while remaining sexy and dangerous.
2. Where to get your female sexy tattoo? Areas that accentuate a sexy tattoo are upper arms, upper back, and upper thigh areas. Other areas may work well also, but one area to avoid is the lower back. While this area has been viewed as a sexy place to get your female tattoo, it's been played out and become too much of a trend. Now slang terminology has emerged referring to female low back tattoo's as "tramp stamps". So instead of "sexy", low back tattoo's have turned into trendy and unoriginal.