In our quad my wife's bf has a penis that is about 3 inches longer, but the ladies both his wife and mine have no problem with mine (being about 7in) in fact his wife prefers my size. This is. A bit weird lol. And for all you women out there men do think about the other guys equipment and stuff, but all I can say is size does matter but not nearly in what you are thinking.
I would honestly take this off the table in poly discussions and if that is your only concern you are golden.