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I had a g/f who could take about 12 inches of this flexible 18 inch doubleheaded dildo in her ass. She'd back into me and fuck this thing like a pro. And she was 5'2", 105 lbs. No damage after three years of regular ass ramming fun!
I'm certainly not a doctor, but I've been banging my wife's ass about five times a week for 14 years. I'm 7.5" and can slam it into her, balls deep, with no problems. So, I say, "Bang away!"
It's not the length that will harm you (doctors go in way more than 5 inches. a sigmoinoscopy gesi in a couple of feet, yes feet). Its the sharpness of the object being inserted, and the angle you insert something. Just take it slow and you should enjoys years of satisfying fun. When you feel resistance, or pain, stop.