Does anyone know what country has the highest participation rate of anal sex?
I started this to discuss which countries have high participation rates but I am wondering if cities are also worth looking at. Why? I like numbers 
and I love anal.
This can not be known because anal sex still isn’t openly spoken about. I would even dare say that the countries where people talk about anal the least, my be the countries that practice it the most.
You don’t know the power of statistical methods and sampling 
but I take the point, so we don’t talk about what we don’t know but what we do know. There are methods available to collect data anonimously which do help with estimates of anal activity. Sites like the International Union of Sex Workers collect data on sexual practices. While this is a more selective group (with its own biases) nevertheless would certainly have data that would identify trends that could be extrappolated back to the general population. See Anal Sex Statistics 2024 for example.