Some thoughts:
I can see some folks getting (legitimately) upset about words and phrases that are pejorative in nature: Welsh Rabbit, Jews Harp, Indian Giver, Dutch Treat and the like. I can't, for the life of me, see why master/slave combinations (whether in computers or automobile braking systems) or male(convex)/female(concave) connectors should bother anyone. There doesn't seem to be any value judgment implied nor stated, and I frankly can't think of any equally-clear replacements.