Have you ever got in the tub and excessively lubed yourself up and maturbated with toys? The only problem is that you have to be careful not to slip when you get up. Rinse off well.
I am 6'4"...pretty uncomfortable.... little tight. Having said that, I was on a business trip to Boulder couple years ago when we were looking to buy a new machine. They put me in a very nice hotel...the bathroom had a huge/deep bathtub. I took advantage of that!