Cowgirl is a great position, very relaxed and great view, I tend to leave it for the end of the session when I am getting tired.
Having said that, it is a dangerous position. One day a girl was riding me frenetically when she lost control and managed to bend my penis a bit. Ouch!! it was a bit bruised for a couple of days afterwards.
Since then I try to avoid that position and I prefer standing up at the side of the bed for doggy or else with her on her back and her legs resting on my shoulders.
I never tried the amazon position but looks hot as fuck, but I am a bit reluctant to try after the aforementioned episode...
"THE CLEANER THE CLIENT, THE DIRTIER THE SERVICE..."
" I always leave them better than I found them"...