Let's talk about this. It seems that it has come up in several conversations lately. Shampoo. Soap for your head.
Years ago, I learned that hair should be washed (thanks, Mom), and that I needed soap to wash my hair. Fortunately, we kept soap in the bathroom, right there near the tub, so it was easy to find the soap. In the Army, we didn't have much hair, so it really didn't matter. It came as a shock to me that men use shampoo. Why? If you're in the shower, there's a bar of soap in your hand. If it's good enough to wash your butt, it's good enough to wash your hair. Start and the top and work down. Which leads me to this graphic.
Don't get me started on shaving cream, which is just soap. You've got a bar of soap in your hand. You don't need a mirror to find your face. Shave in the shower like a man.
I understand that there are some (allegedly) male adults that use shampoo, but I don't think they should call themselves men. If you use shampoo, keep it to yourself.