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Yes it is endemic at MIT. Yes there is an explanation. According to Jerry Letvin, serveral years ago in his comparative psysiology class he explained how one sexes a toad. It seems that if you squeeze a male toad just behind the front legs, he will croak. A female will not. Thus a toad in a pond in the middle of the night can determine whether the other toad next to him is an appropriate subject of his amorous attentions by climbing on and listening. Apparently, it became semi-popular amongst some MIT students to sheak up on each other & poke from both sides just under the arms. Thus "no toad sexing".
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