If I decide to free-fall, relying on my natural instincts to make this relationship last, I am going to go splat. My genes and hormones are single minded sods. They don't have hearts or consciences, they don't understand love or tenderness, loyalty or commitment. But I do. An outline of walls, placement of windows and doors define the boundaries within which space can exist and be expressed in content and colour.
Parents define boundaries for their children early on.
Over the years some re-interpretations are sometimes needed as essentials get confused with cultural niceties. At some point, sooner rather than later, parents have to let go and trust that their precious kids will choose for themselves the ethical code that will enhance their personhood and maturity. With no sense of personal or societal boundaries they get 'lost in space', unsure of identity or self-worth. There was a great song once about skin. Our no's and yes's not only protect but define us.