This may be a repeat, but.....
When the Bible says feet, it really means genitalia.
Well there's two reasons this isn't true.
1) The Bible has no problem mentioning genetalia
Genesis 17:10 This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.
Deuteronomy 23:1 He that is wounded in the stones, or hath his privy member cut off, shall not enter into the congregation of the LORD
2) The number of times that washing feet is mentioned in the Bible as a way to treat guests in your home. I won't bother with the references, but you'd think that one of the other nations (Egyptians, Babylonians, etc) that we have writings from would have mentioned SOMEWHERE....
"You know I went to Israel/Judea and you wouldn't believe what they wanted to do to me!" So either washing someones "stones" was a common practice (in which case why hide it with the word "feet") or it just didn't happen.