How often is too frequent to have anal sex that can cause damage to the anus?

The anus is an exit portal. It involves delicate muscles that coordinate waste excretion in a complex way. The vagina is designed to be a receptive organ with toughened walls from estrogen stimulation. Recovery from a few experimental episodes may occur, but one episode of anal sex can damage the system. Regular anal sex can lead to constant leaking or requiring a plug.

Every episode runs the risk of tearing, infections, injury and pain and potential for loss of continence. The anus is an exit not an entrance