It seems there is a smug sarcasm that you're so sure, jaded and pretty narrow in understanding males or people evidenced even from the op.
Let me spell it out.
Just because a male will fuk you, to put it plainly, doesn't mean he wants you or even particularly attracted either. If you know anything about males its nothing to be flattered by as some males will fuk anything (as long as there is no effort on their part if they arent interested)with a pulse rather than jacking off, if there is no one else etc. In that sense its nothing to them. This basically 'nothingness' is hardly a threat to a platonic relationship or a threat to any female from unwanted advances. Stay with me now, all this above has nothing to do with the subject of attraction.
You seem to think that just because a male may have sex with you, it means something as in maybe they can't be friends because they might. It could be like someone offering a stick of gum, may not turn it down.
The point of this discussion has been about active, intentful, motive driven attraction and platonic but true friendship.
There are males who can have true platonic friendships with women but again its the type of male as with anything in life.
You seem to equate superficial male acquaintances with friendships. My male friends are there for me and vice versa just like any friend regardless of gender. Ya know, when you meet someone and find out you think alike or like each others sense of humor whether goofy etc and not all chemistry between two people will be physical/sexual/romantic. You can just get along well or certain friends you can talk to about certain subjects and they understand you. Attraction of various sorts is really easy to read and feel. If you assume every male wants to sleep with you, that's you. The key word here is 'want' like desire that supersedes anything else about you. While you are talking, if all they are doing is pretending to agree just because they want to get in your pants, thats no friend but this is very easy to spot. Its easy because you'll soon find out usually within a couple conversations whether this person gets you or you get them from multiple signs and signals overt to subtle. I met most of my male friends based on hobbies at first anywhere from video games, cards, etc. Men are like women in they have preferences too besides just the male dog or female slut.
But again, people have different experiences and pick different people as friends. Um, I would laugh in their face if my male friends propositioned me in any way and they know that. Its like brother and sister. Are you getting it? Its because we have that mutual understanding, you can FEEL it. You can sense and feel the type of chemistry you have with someone whether its platonic or not. But here is a clue: if you can't and you aren't sure, most likely there may be something not totally aboveboard. Friends don't front. It may be you as well who is incapable of this type of friendship if you view all males as just fakers wanting you sexually. The effect would be to consciously or unconsciously put that out there and that's what you will magnetize on that wavelength.