Why do men seem to want sex from me and not a relationship?

Despite being a modest and reserved person, a lot of men seem to approach me in a very sexual way. They often make it clear either directly or through their actions that they only want sex from me. They are quite disrespectful and have no interest in getting to know me as a person.

It not like they are fuckboys because eventually they end up in relationships and seem to treat these women well.

It’s to the point to where if all I have to offer is my looks and body.
Why do men seem to want sex from me and not a relationship?
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