>>44254725This.
Humans are actually culturally and physiologically optimized for it.
We share unique social and sexual features with the Bonobo, which practice rampant incest for entirely social and bond-deepening purposes.
Siblings engaging in incest as they develop is quite healthy, as it deepens their bond, and makes both more comfortable and confident around sexual topics in general.
The potential genetic harm of incest is often vastly overstated, it only becomes a problem after many, many generations of it, and even then, the Westermarck effect exists almost certainly to balance this.
Humans are one of the most optimized creatures on the planet for practicing incest, and twins in particular are even moreso due to the deep bond they already tend to share.
