This gets at the fundamental dialectic so well reviewed in When Harry Met Sally (1989). Is it possible for a heterosexual man and woman to be "friends", that is, without one of them desiring sex? The answer in that movie and in most examples we have from life is an unambiguous "no".
In this case, probably not. What we probably have here is a man who came of age in roughly 1944 being somewhat intimidated by the overt sexuality of the definitely non-chaste, modern Black Widow. An excellent reminder of how hard it is to really understand the past. Things were different then.