Is my female boss flirting with me?

Marty Mcfly · Yahoo User

We work at a Bank, of course we all dress in business attire. My boss invited everyone over to her house, since it was her birthday, she is recently divorced. (no kids) After work, we all went home slipped into something comfortable and went to her house. Everybody bought her gifts such as a Bottle of Wine or Liquor. Well this was the first time my female boss has actually seen my "bad boy" side because she did not realize I am heavily tattooed and pierced. In which I take off my piercings at work at my tattooes are covered by my long sleeved business suits. After a few drinks later in the night, and the guests were starting to leave, she asked me if I have any more piercings. I replied yes there is more, I have my penis pierced. She then asked if she could see it jokingly, I guess in my drunken state I replied sure but I cannot show it to you out here. She led me to her garage where I whipped it out just me and her. She started laughing, this morning she started calling me. What the?I know I was buzzed when I showed it to her, but now she is like calling me and asking what am I doing this long weekend? Plus I know on a rule of thumb NEVER to date colleagues or coworkers. How can I politely turn her down?