Why do cis gendered people put she/her or he/him?

sweettoothg
I hate using that term but why do biological women and female put their gender in the bio? Does it have to do with lbgtq? Because most of the time we can tell what someone’s gender is by looking at them. I feel like it makes more sense for a trans to do it rather than a straight 15 year old girl. A lot of people from the younger generation do this why?
Updates:
29 d
*biological men and women
Why do cis gendered people put she/her or he/him?
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