Kinky sex is usually meant to include any sexual practice that deviates from the 'norm' , quite often kinky sex includes bondage gear, sexy uniforms or role play.

(used of sexual behavior) showing or appealing to bizarre or deviant tastes; "kinky sex"; "perverted practices"

(gen.) Those with a wide range or kinks and sexual desires. Often having a high libido or urge for complex sexual relations.

interest in alternative, sexual activities; generally refers to SM/BD or leather/fetish lifestyles

sexual activity that is somehow non-traditional or exotic

Slang for sexual activity that is considered to be outside the norm.