Urban dictionary has a definition for 'polynesian sex' from 2022 as day 1: look at each other day 2: touch and taste, no lips or genitals day 3: kissing allowed day 4: touch sensitive areas, no genitals day 5: "passionate things," no genitals day 6: don't look at each other all day day 7: do whatever you want no masturbating for the whole time. I assume the phrase has a weird geographic origin.
this manga obviously doesn't take place over a week, but it's a similar buildup.