Regarding getting off from a shower head, it is the water pressure, not the actual head.

What I do is let the water beat down right above my personal place, not actually touching the personal place, until I feel the sensations running thru my entire body. I then control it with the shower head, letting it pulsate directly on my personal place until I feel an "O" coming on, then move it away..

repeat this until you feel like you are going to explode...then just enjoy the ride!! One of my fav ways to get off doesn't beat a hot tongue, tho...hope this helps!