Fetish etiquette

What is the right place and time to discuss a Fetish session keeping in mind that you would most likely be blocked for using "explicit language" over the phone?

Fetiquette?

I always ask via email "do you offer any fetish activities "?

With me I don't discuss anything fetish unless my date is already screened.

Can someone give me more information. Scheduling is much harder than usual. How much lead time does someone usually need to prepare? Is there any reliable way to know who does what?