So long as you continue to use proper relaxation techniques, lots of artificial lubrication, and don't insert monster-sized objects (double anal, anal fisting, ginormous dildos, baseball bats, bowling pins, etc) you should be fine. I would, however, suggest not having anal sex daily. Once every week or 2 should be fine. And make sure you are both sober and drug-free. You don't want other influences affecting your good judgment.
Much of the horror stories you hear of are from people that take things too far. Huge objects, grossly extended sex times (hours and hours without break for the camera, damn viagra!), poor preparation and improper relaxation, and abusive pounding leading to damage to the sphincter muscles. How often in porn do you see real couples in love having loving sex? Most of the time it's just wham, bam, thank you ma'am. And the anus just doesn't respond well to that kind of abuse.
Take it slow, caring, and gentle. And enjoy what nature gave you!!!
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