To be honest, for me anyway, this is completely a non issue and something not worth discussing. If I had a daughter, my role as father would be to provide and to protect, not anything like this.

When I was living with my girlfriend at the time who’d later become my wife, we both lived with her mother and sister. My partner had really gorgeous black hair, it was straight, sleek and past her waist. I would maintain it daily and get absolutely rock hard doing so which would often lead to lots of fun. She once asked me if I would help her sister with her hair without “getting hard” and I said absolutely. Her sister also had long hair, it was also straight, really sleek and beautiful and it was longer than my partner’s, it was down to her butt.

Whether it be your wife, sister in law, mother in law, daughter, you should always exercise a little decency and act appropriately towards all those people. If you’re a good man, it won’t even be something you’ll need to think about.

My opinion.