Interesting take. I'd guess it's pure commercialism. Deadpool went in knowing it was going to be R-rated, and they broke out the strap on. Most of the movies the article mentions are going for PG-13 so they can sell more toys. That's my take.
PG13 movies from the 80-90 had sensuality too. They were not so sterile.
Anyway, best example of this phenomenon that I can think of is Casino Royale vs No Time To Die. There's chemistry and sexual tension between Bond and Vesper since the moment they meet.
Fast forward 15 years and in NTTD Daniel Craig and Lea Seydoux have nothing at all. Even though they supposedly have a past and apparently a daughter too. The relationship feels, for the lack of better word, clinical. Like just another checkbox to be ticked.
The sexiness of an outfit is directly proportional to the perceived possibility that a vital piece of it might fall off.
This basic theory underwrites Stripperiffic clothing, Impossibly Cool Clothes, and pretty much anything else you stick characters into: what makes clothing sexy is the potential for a catastrophic Wardrobe Malfunction. The Trope Namer is William Ware Theiss, costume designer on Star Trek: The Original Series, who first codified the concept.
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Though Theiss was a costume designer, according to Inside Star Trek: The Real Story by Herb Solow and Robert Justman, most of the costumes — following this theory — were actually somewhat more modest before being "improved" by Gene Roddenberry.