Stop visiting porn sites? <duck>
Seriously though - people who get lots of these (multiple ones every day) are people who have provided their cell phone number or "texted" to marketing companies or product companies. Once you do that, your information is sold to list companies, that in turn sell those lists to other marketing companies.
The only way to prevent it is to use your cell phone ONLY to make phone calls to people you know personally, and never click on ANY link that ANY of those people ever send you.
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