A problem that consistently interferes with one's ability to complete the sexual response cycle is called a(n)

A) STI.
B) paraphilia.
C) sexual dysfunction.
D) refractory period.

Sexual dysfunction refers to a problem in any phase of the sexual response cycle (desire, arousal, orgasm, and resolution) that consistently interferes with one's ability to complete the cycle. STIs and paraphilias may affect sexual function but are not necessarily consistent problems that interfere with the entire cycle. The refractory period refers specifically to the recovery period after ejaculation in males, and is not a problem that interferes with completing the sexual response cycle.