The Aish guy is a moron. The permission to accept a handshake is not just because of the issue of not embarassing someone else. Frumchiks embarass others all the time. It is because, as he knows perfectly well, shelo b’derech chibah (not lustful touching) is not covered by dinnei negiah. Face it, we live in a society where we are pretty well educated on the difference between a hot-hug and just a hug. When the president gives a widow at gravesite a hug, do we have any trouble watching it and knowing whether he is hitting on her. Frankly, I know of virtually no lustful handshakes I have gotten in my whole life.