I was a single Dad for years. I had to teach my daughter to shower and wash her hair. I always made it clear that her body was private. Sure, when she was in diapers I saw her tons, but once she was able to speak and communicate, her shower time was very unshared. I stayed in the room and passed her things around the shower curtain such as shampoo, and later the most challenging thing that I ever had to do in my life was get her hair looking proper for school.
Those were tough times for me.
We got through it. Praise God.
Pretty much the same for me with my daughter. And when she had her three girls I had the devil of a time trying to keep those little girls from running around in just their underpants when they stayed over or visited.