Get tested for STIs every three months if you are having anal intercourse with more than one partner, and every six months if you are monogamous. I do body squats in the shower to push the water up a little deeper. When I go hard, I use silicone lube.
I always have to make sure things are good down there before having sex. These are tiny tears that may not bleed at all and will probably not cause any pain, but they are still gateways for HIV transmission. Incorporating a fiber supplement like Metamucil into your diet can help.
Since then, I have used nozzles that are longer, slender, and made of smooth PVC or rubber that clean deeper. Silicone lube can also be used in the shower, since it will not wash off with water, meaning you can use it for douching and for shower sex. Good cleaning is also about relaxing your ass muscles and getting comfortable with the feeling of being penetrated before you start play.