Why don’t some men take NO for an answer?

For example, I have a guy friend I hungout with not too long ago, I hungout with him of the intentions as a friend, but he pressured me into hooking up even though I kept saying NO. He continues to hit me up everyday asking me to hangout. Another example, the guy I lost my virginity to, years ago, did not stop when I asked 5 times. Another guy, I know from highschool, is a friend of mine, but constantly makes sexual remarks at me and when I say that I don’t want to hook up, I get called “wierd”. Im not weird, I am just not into hooking up anymore and im done being used. I make myself clear, but it seems like it goes from one ear, out the other ear.
Why don’t some men take NO for an answer?
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