Dear Andrew
If it was dangerous or damaging to have anal sex a lot of people would be walking around with unhappy assholes. Get my book "Orgasms for Two" where I have an entire chapter devoted to anal sex, one of my favorite kinds. There are skills involved whenever you penetrate a body part. You naturally added saliva but next time try some of my Almond Massage Oil. Before you experiment with having anal sex with a partner, either pitching or catching, spend a little more time practicing with yourself. Remember, a woman can penetrate you as well as a man. So anal sex doesn't necessarily require a gay man.
The Mr. Smoothie Mr. Smoothe that you were looking at would good for you purpuses. Also consider getting the Hitachment that fits on the Hitachi Magic Wand or the Aneros, which encourages easier erections, produces more intense orgasms and stronger ejaculations. Go to my Sex Shop for these toys.
Enjoy some fabulous orgasms that include anal penetration during masturbation. What fun! Enjoy yourself.
Betty