Are you folks trying to honestly say that you think that Weekly Shounen Sunday is going to allow actual sex in their manga magazine? For crying out loud, the romance level in this shounen manga is off the scale for this magazine. Granted, I've not read all titles published in this magazine, but the ones I have read over the years do have a romance element, but it is kept to an element where little progress is ever made. So it is astonishing that we have a shounen manga about a young married couple.
Look, I get that at 18, if I'm married to Tsukasa, I'm going to want to bang her a minimum of 10 times a day. But Tonikaku Cawaii isn't reality. Its a bloody fantasy where Tsukasa may in fact turn out to be the mythical Kaguya-hime (or someone very similar). Hata-sensei is keeping things as a clean, wholesome romance with a comedic wink at those audience members who are older. So when it comes to sex, the best folks are going to get out of this manga series is a "you decide whether they had sex or not" moment.