Wearing butt lifters and/or pads + the pants cut with individual cheeks for the butt. It's like saying women got bigger boobs when the pushup bra became popular. It's definitely more popular to show off, but when I was in the dating scene 20+ years ago, huhwyte girls with a 🍑 was a thing. Usually it was girls who danced ballet and such who grew up with ridiculously strong legs and glutes that couldn't hide it. Now that it's in vogue, women do squats and various exercises specifically to accentuate their butt.