One of the core principles of euclidean geometry is that the shortest path between two points is a straight line between the two.

Non-euclidean geometry, then, means exactly-not-that. Taking shortcuts in higher dimensions (like going from Russia to Canada through the north pole, which looks impossible on a flat map, but works on a sphere), wormholes, portals, these all violate the base principle of euclidean geometry by allowing shorter-than-direct travel, so to speak. Interacting across panel boundaries technically counts as well, from an in-universe perspective.

Non-euclidean sex, then, is about using this kind of "shortcuts in 3d space" for sex. Voodoo sex is sometimes mistakenly included as non-euclidean, even though it's usually more like long distance sex that uses magic instead of teledildronics.

See Also:

• sex
• non-euclidean_sex
• non-euclidean_penetration
• voodoo_penetration
• portal_sex
• voodoo_sex
• cum_teleportation