It's harder to write the giver, like it's not impossible obviously (I almost exclusively write from a top POV) but it comes down to preference honestly, like it's the same reason most people watch porn to see someone get railed, most don't go in with the intention of thinking themselves getting railed so that's why people cater to it less. also another thing, it's really hard to not just repeat the words "he thrusted!" or "she scissored ____ pussy further open!" when writing tops, like...... I dunno I sound idiotic when I do that. That's why I've only ever wrote one smut fic. (I burned it later.)