The traditional armbinder is one of the sexiest rope ties possible. It can be challenging to implement if you don’t have a bottom who can naturally touch her elbows behind their back. Having an assistant handy to help hold arms close together when trying this tie for the first time is a good idea. Also, make sure your bottom has thoroughly stretched before attempting this tie to prevent any muscle or tendon damage.
Standard Safety disclaimer: Bondage is fun but it can also be dangerous. Ropes that are too tight or in the wrong place can cut off blood flow or cause nerve damage. It is your responsibility to ensure that you play safely. Whatever you do, have fun doing it!