Well I guess we'll just have to disagree then. I happen to think it wouldn't be preserved for future disciples unless Christ wanted us to do what he commanded.
Then for consitencies sake why didn't you do them all? I assume you didn't do any holy kissing because you separated the men from the women, if not, why using your logic? A holy kiss would have been between same sex and opposite sex but you separate sexes, why? Why did the sexes separate when a woman washed Christ's feet and there are other instances of foot washing of mixed sexes and nothing taught about it, fair question? Now I would have a big problem with another man washing my wife's feet or kissing her, granted?