Some of them are admittedly not bad looking. I know that on Stormfront we like to pretend that it's obvious that every White-looking Jew isn't actually White, but often, you really can't tell. Some have such a predominantly European look that it's difficult even for people who are on the lookout for that type of thing to be able to notice. Sometimes it requires more attention to detail or more anthropological knowledge than the average person has. So, even a well intentioned White lady with healthy sexual morals might begin a relationship with a Jew and not even be aware. This isn't even slightly comparable to people shacking up with Negroes or Asians, which are obviously not White.