No, anal sex does not make the anus permanently loose.
The anus is very elastic, which means it can stretch and then return to its normal shape. When you have anal sex, the muscles around the anus can stretch to allow for penetration. However, they will tighten back up afterward.
Understanding Elasticity
    Elastic Nature: The anus is designed to stretch when needed, like during a bowel movement or anal sex.
    Muscle Recovery: After anal sex, the muscles will usually return to their original tightness.
Factors That Affect Tightness
- Relaxation: If you are relaxed and use enough lubrication, anal sex can be more comfortable and enjoyable.
- Practice: With regular anal play, some people may find it easier to relax their muscles, but this does not mean they become loose permanently.
Conclusion
In summary, while the anus can stretch during anal sex, it is built to bounce back. Regular practice may help with comfort but does not lead to permanent looseness.
The key takeaway is that anal sex does not cause lasting changes in tightness of the anus.