I wouldn't normally promote in this way, but in one of my recent posts I demonstrate how pretty much anything we do in sex, it's done, or over-done in nature, including vomiting in each other's mouths, urinating on each other, group sex, homosexuality, necrophilia, rape and more...
https://steemit.com/nature/@mobbs/weird-sex-part-2-a-little-nicer-this-time-please
'unnatural' is an increasingly false concept, it seems
Yeap, glad you shared it. I will check it out.