Tongue piercing
You know why girls don't need their father's permission to get a tongue piercing? Because 99% of the time, THEY WEREN'T RAISED WITH A FATHER WHO WAS IN THE PICTURE. Opt for a nipple piercing instead: it's easily concealed but you can show it off in sheer lingerie coupled with a moto jacket for an edgy, sexy look while you're out.
[Photo via @tonguepiercing]