Thank you for your question.
No this is not a regular addiction. Addictions are not normal. Usually there is a compulsion to keep doing the behaviour even if you know you want to stop. Often anal stimulation in men stimulates the prostate which produces pleasurable sensations. It is one of the reasons why some men enjoy receiving a finger or other object via the anus.
Next Steps
if you wish to stop the behaviour you need to see a counselor specialising in sexual problems or addictions.
Health Tips
General counselors may not have enough experience with your issue so you may need to see a few counselors before you find the right one