There are several threads on this very topic --check the archives for more information. Yes a submissive ALWAYS may say NO to something they are uncomfortable with- and it NEVER makes them any less submissive. If this was someone you wanted to persue a further relationship with (although after spouting that BS I don't know why) --you would then discuss what makes you uncomfortable and see if it may be something that with time and patience you may want to explore (subs can be led slowly into new experiences). Communication is the most important part of a D/s relationship along with trust. If this is someone new --there hasn't been time for the trust to build up --but communication lines should be open -both ways. I hope this helps --talking to other subs (and doms) is a good way to understand too. Please feel free to PM me if you would like to talk.