Guys can be
really dense.
The absolute worst was when I had an out-of-town friend crash at my place after a party. We were both a little drunk, I changed out of my clothes (super cliche with the door open) into just a t-shirt and thong. We were talking in the kitchen and I made sure he got a good look by getting things from the top cupboard on my tiptoes (totally cliche, I know

), I even turned the conversation towards sex. And
nothing from him. We just said goodnight and went to sleep. I thought maybe I totally misread him and he was gay but a few days later a mutual friend told me he had a crush on me

So wtf? I don't know how much more obvious I could have been other than putting a post-it note on my forehead that read "please put your penis inside me".
And then there's the
other extreme that interprets even the tiniest most innocent bit of attention as flirting.
Saying hello or smiling at your dog if it does something silly is not an indication that I want to sleep with you

Or in the case of LPSG, liking a witty post does not mean you should send me pics of your penis