This is definitely a big problem for us guys. When we put in effort you expect a return, almost like a business trade. You won't put your time in shit you don't care about, however women are the total opposite of this. Women can put in what we would "perceive" as in input but totally mean absolutely nothing to her. They're very fluid guess, theres no real consistency to them.

For instance they will send nudes(obviously this is my experience lol) randomly with no cohesion on my part,or slightly sexually suggestive images of themselves. You'll ask them when they're free to visit xyz and it will get blanked.

Or they ask you when are getting to get together to randomly not even replying. Or you'll be halfway through a conversation where they were putting decent interest levels in before they just totally stop replying.