I don't have to worry about this unless I am at my home away from home. When I do have kids I won't have this issue either. My room is my room keep out!!! I have a lock on my door at my house and at my cousin's
Mr Willy makes an excellent point -- Boundaries are important. Assuming your children are of a reasonable age to understand right and wrong you, as a parent, shouldn't have a problem keeping them out of your adult business. Kids don't have to be the end of your passion
Many of these suggestions work for older kids and I should have specified I have 3 girls 5 and under so while the oldest doesn't go in our room, the 2 year old thinks its her room away from her room lol.