(By the way, the article also tells how "On [R.'s] wedding night, her brand-new husband called her into the living room, where a large picture of the Admor of Gur - the rabbinic leader of that Hasidic sect - hung on the wall. He told her she had to imagine the rebbe's face when she observed the mitzvah of ishut (conjugal relations), so that she would have "righteous" children". I'm not sure, but isn't this a problem of one of the Benei Tesha Midot, namely, Benei Temura? See BT Nedarim 20b. On the other hand, see BT Brakhot 20a where the Talmud relates that "R. Yohanan was accustomed to go and sit at the gates of the bathing place (- mikvah). He said: When the daughters of Israel come up from bathing they look at me and they have children as handsome as I am." Vezarikh Iyun.)
But is this attitude unique to the Gur Hasidut? While this may be the case today, it wasn't this way in the previous century. The following comes from R. Avraham Korman's "Ha'adam Vetivo" (Tel Aviv 5763, pp. 253-256), where he retells several stories which took place in pre-war Europe (I marked them with a red border) and as it seems from these stories, the Gur attitude was far more widespread then, at least in Hasidic circles, something that has definitely changed nowadays.
Not surprisingly though, going back to the 18th century we see this attitude was prevalent even in the general Jewish population and it wasn't limited as it were, to hasidim. An example of this is found in the autobiography of Solomon Maimon. While writing about the Polish Jews of the time, he describes their innocence and naïveté:
I will only add that Maimon's theory about being separated after menstruating will bring a couple closer to each other is actually sourced in BT Niddah 31b where it says "It was taught: R. Meir used to say, Why did the Torah ordain that the uncleanness of menstruation should continue for seven days? Because being in constant contact with his wife [a husband might] develop a loathing towards her. The Torah, therefore, ordained: Let her be unclean for seven days in order that she shall be beloved by her husband as at the time of her first entry into the bridal chamber."