The reason why the cat keeps rolling after using the cotton swab is because the estrus has been relieved, so the cat will keep rolling after feeling comfortable, which is normal. However, it is best not to use cotton swabs to relieve the estrus, because using cotton swabs can easily cause the cat to have a false pregnancy. In severe cases, it can also cause uterine diseases. If you want to alleviate the cat's estrus, it is best to breed the cat or undergo sterilization surgery. You can also play with the cat more to divert the cat's attention.