Yeah other languages normally get their swears from words for things that are considered taboo but english just has such a variety. We have swears/slurs that are related to:

• bodily functions
• bodily fluids
• sex
• relationships
• some animals
• being sent to hell
• various other religious (mostly catholic) things
• thinking you’re better than others
• thinking others are better than you
• and probably some others that I’ve forgotten about/don’t know of

But also not all words from those categories are swears and not all of those swears are always swears. We also have words that sound/look like swears but aren’t.
edit: it would appear that I am incorrect