arousal from
bondage
People who are aroused by bondage include Dominates/Dominatrixes/Dommes, submissives/subs, those who practice mummification and other forms of bondage, and various classes of voyeurs.
Many porn sites online have sections devoted to bondage and domination while other sites are wholly developed to appeal to people who are vincilagniastic, with thousands of images of people bound in various manners.