So making sexual advances in a professional setting is A-OK, as long as you only do it once per person?
It's not in a professional setting.
Not saying that what he did is OK (it's not) but let's keep our facts straight.
The e-mail "later that evening" was not discussing the interview results. It was a later email, presumably on his own.
People go to GREAT lengths for the "eventual goal of sex"
Like get married