What is "unalterability"

Usage examples of "unalterability".

From her reaction to the blunt-ness of Rob's marred body, his special unalterability, the abrupt initiatives of his sexual nature, she readily inferred that fantasy, her own, had reached its vanishing point, an event that returned sex to those locations she felt it had long abandoned, between the actual legs, in and around the actual mouth, on the breasts and under the testicles and in the hands, on the tongue, in the actual hole.