Think of it as % of being gay.
Maybe you notice a guy be good at something, o r notice he has big muscles. You're now 10% gay. Just make few other examples like it, you just think you're being friendly And simply like being around them.
This takes time to piece together and being open about your sexuality being a spectrum rather than binary is a tough mental barrier because your entire life you were told to like X.
Admitting that the other gender has a nice ass takes time. And it is not 100% sexually driven. This applies to both men and female, but everyone is different. I'm just trying to give you some backstory to your women in 20s question as a possible scenario out of many.
So many are clearly bots it's beyond obvious.
At most some will at least have the same 2 comments randomly responding to people... But people fall for it.