Quoting from the appendix to Steven Pinker's 'The Blank Slate': This list [by Donald E Brown] was compiled in 1989 and published in 1991, consists of primarily "surface" universals of behaviour and overt language noted by ethanographers .. It omits near universals ...

And, there it is: sexual regulation

(and incest is listed as a separate universal, so this is regulation apart from incest)

Yep, some form is known in all societies we have encountered or studied.