I can't speak for MrMind, but typically if I want to introduce novel things into my sex life, I talk about them with my partner when we aren't having sex to see whether there's mutual interest. If there is, I start introducing them. I rarely talk much while having sex, relying primarily on non-verbal communication (which is quite adequate for "is this OK? more of this? less of this? something altogether different?" kinds of negotiations). He's more inclined to negotiate verbally during sex, which is also fine, but not really my thing.