Atypical sexual behavior is sometimes used as a synonym for

A) nonconsensual sex.
B) compulsive sex.
C) sexual variation.
D) paraphilia.

Atypical sexual behavior refers to sexual practices or interest that fall outside of traditional societal norms or expectations. This can encompass a wide range of behaviors, including same-sex attraction, BDSM, fetishes, and other forms of consensual sexual variation. It is important to note that atypical sexual behavior is not synonymous with non-consensual or harmful sexual behavior.

Therefore, option C (sexual variation) is the best choice. Options A and B (nonconsensual sex and compulsive sex) refer to problematic sexual behavior rather than sexual variation. Option D (paraphilia) refers to a specific type of sexual variation that involves intense and persistent sexual arousal towards atypical objects, situations, or individuals. While paraphilias fall under the umbrella of atypical sexual behavior, they are not synonymous with it.