Pisces venus/mars in my 12th house, here.
To me, my 12th is my private place, my sanctuary. My little home away from home. It's what I keep to myself. It's MY stuff! No matter how murky, dirty, ineffable, blurry and so on...it's my stuff.
My Sag sister (with a stellium in her 1st) has accused me of being too private, bordering on paranoia. And with my mars there, I tend to do things away from prying eyes and ears. In many ways, my motto is - as far as my privacy is concerned - if it isn't a matter of life and death, no one needs to know what I'm up to. It's nobody's business but my own. And it isn't as though I delve into anything immoral or illegal.
Big or small, if I consider something a private issue, I'll keep it that way.