I get a lot of DM's about incest, is it *actually* that common as it seems on Reddit?

I don't mean watching incest/step bro porn i mean actual incest, when i recently posted asking people what they're into that unusual, strange or taboo i got loads of DM's of people claiming to fuck their cousins/sisters/dads etc and I usually just assume its just RP or their fantasy but I'm starting to think it might actually be more common that people actually do it.