On top of ATWT managing to keep mention of the Luke and Noah's first time out of the soap magazines and out of various spoilers. CBS has also omitted mention of the much anticipated and historical event from their recap (link below). I find it hard to believe that these are all coincidences. I seen some people saying that ATWT worked on keeping this out of the soap mags and spoilers to make it a surprise for the viewers, but the fact that they have also left it out of the recap really brings this theory into question. First of all, had the fact that Luke and Noah were going to make love be spoiled by the mags, it would have probably increased ATWT's viewership for the day. So, in my mind there was no logical reason to keep the soap mags and other sources from spoiling this much anticipated event. When couples make love in an episode, the spoilers often say they are going to make love, especially if it's a really anticipated moment, as was the case with this scene.
I don't buy for a second that this is just some coincidence. I think CBS/ATWT is deliberately not promoting this Luke and Noah's story. Someone at ATWT is either ashamed of the story or is worried that this couple will outshine some of the other couples (maybe both) and it shows in both the writing and the promotion of the story.