Dear phantasy....safewords are there for the use of the Dominant as well as the submissive....there will be times in all relationships when we may need to use them.....not just in scene either. Having a safeword that can be used at anytime is a healthy way of informing your partner that you may be feeling uncomfortable/ unwell or that what is happening must stop immediately.
It goes hand in hand with achieving a happy, healthy balance in our union with someone we care for and about.
Regards
Shredder1