If nobody had ever mentioned it to you, it wouldn't have mattered.
It's just stuff, but we impute stuff with meaning, because in our minds, some stuff is more important to us than other stuff.
If you have a dharma book, or a rupa (statue) or Buddha image or your teacher's picture, or something like this,
you have already sort of 'invested' a kind of meaning to it, a special regard for what it is.
That is the frame of mind you are using, and that frame of mind is the tool you are using.
So, there has to be some consistency in your attitude about things.
What that consistency looks like to you, is up to you.
There is nothing bad bout sex, but some people feel that, for instance, the dining room table is not an appropriate location, because we associate that space with eating food. So, it is sort of like this.
Things are relative. This reminds me of something I encountered a couple of years ago.
I was in a bookstore in Taiwan and the floor in the kids book section was raised up a little bit, and the floor was different. people took off their shoes before stepping up into that section. I asked my friend why people did this, since they were already inside the bookstore wearing shoes anyway.
He explained that this section was "inside the inside", meaning that relatively compared to that kids book section, the rest of the store was "outside". And you always take off your shoes when going from outside to inside.
So, maybe the bedroom is not the best place to set up a shrine,
but having a shrine in the bedroom is different than making out in a shrine room.
But then , getting mushy in a shrine room is different than getting shiny on a mushroom.
Profile Picture: "The Foaming Monk"
The Chinese characters are Fo (buddha) and Ming (bright). The image is of a student of Buddhism, who, imagining himself to be a monk, and not understanding the true meaning of the words takes the sound of the words literally. Likewise, People on web forums sometime seem to be foaming at the mouth. Original painting by P.Volker /used by permission.