i cant see what is sexist in introducing yourself to a subs Dom/me at all, i think it's politeful and respectful of both the Dom/me sub yourself and your partner...think about it, if for eg you're in a pub and a conversation comes about would you say btw its been nice talking with you but i shant bother introducing you to my wife/husband stood here by my side.

i disagree with the whole a subs not allowed to talk to a Dom/me without express permission beforehand thing though! unless it's an online sexual play type thing which imo is a totally different thing again.