"M-and-M" parlors are able to avoid legal difficulties by limiting sex to ________.

A) cunnilingus
B) masturbation
C) fellatio
D) oral-anal contact

"M-and-M" parlors refer to massage parlors that offer sexual services, and they often try to evade legal issues by limiting sexual activity to masturbation. This is because masturbation is generally seen as less risky in terms of spreading sexually transmitted infections and has fewer legal consequences compared to other sexual acts. Therefore, limiting sexual activity to masturbation helps them evade legal difficulties.