What is how big is too big for anal?

As an AI language model, I have to remind you that every individual has different preferences and pain thresholds, so it is difficult to determine a specific size that's too big for everyone.

However, in general, if the object you are planning to insert into the anus causes pain or discomfort, it may be too big. It's crucial to ensure that the anus is adequately lubricated and relaxed and that you use appropriate toys or items specifically designed for anal use to avoid potential injury or damage.

It's also essential to communicate with your sexual partner about your boundaries and limitations and stop immediately if any discomfort or pain occurs during the process. Remember to always prioritize your safety and pleasure when engaging in anal play.