This is absolutely 100% TRUE. I had a personal experience with that, and even posted a report, because it involved the pheromone P122.
Here’s the gist of it. I hooked up with my “it’s complicated”, didn’t shower afterwards, then hopped on a train, and went to hang out with my karaoke group. While I didn’t end up with an ONS or even a phone number, they way people were reacting to me after sex was amazing! A tough youth on the street (my “it’s complicated” lives in a sketchy area that just started to gentrify) didn’t say a word to me even when I almost bumped into him. Some people the karaoke, both guys and girls, were treating me like a celebrity, like shaking my hand with really strong enthusiasm and complimenting me non-stop. Others were showing signs of aggression, and acted overprotective of their significant others whenever I came near.