Is frequant anal sex harmful to ur body or effect the muscels in your rectum?

Lubrication: If this is done first with the area as clean as possible, even an enema is helpful, lubrication is recommended and a gentle loving process then it is probably ok. If you have lots of feces and the action causes tears in your skin then you are setting yourself up for infection. These muscles can be exercised and kept in good tone by doing kegel exercises.

Can be: The anus/rectum was designed as an exit not an entrance! however if you choose to proceed with this activity, you need to know that infections including std's(sexually transmitted diseases) as well as trauma and tearing of the muscular sphincter can occur. This may result in varying degrees of incontinence (not being able to control the passage of stool and/or flatus.).