What does NTR mean?
NTR stands for 'netorare,' a Japanese term for a genre and fantasy in which a partner is taken by or sleeps with someone else. Online it is shorthand for that cuckold-adjacent theme. In the consensual lifestyle, the real-world equivalent — hotwifing or cuckolding — is always agreed by both partners, unlike the fictional, often non-consensual NTR trope.
NTR is an abbreviation of the Japanese word 'netorare,' which roughly means 'to have a partner taken away.' It originated as a genre label in manga and anime for stories where one character's partner is seduced by or sleeps with someone else, and it has spread online as shorthand for that theme and the feelings it evokes.
NTR overlaps with the cuckold fantasy, but there is an important distinction. The fictional NTR trope often centres betrayal or non-consent for dramatic effect. The real-world lifestyle equivalents — hotwifing, the stag/vixen dynamic, and consensual cuckolding — are the opposite: every partner knows, agrees, and has chosen the arrangement. Consent and honesty are the whole point.
People who enjoy the NTR theme as a fantasy may or may not want anything like it in real life, and many keep it purely as media. Those who do want to explore a consensual version in their own relationship approach it the same way as any lifestyle dynamic — through honest conversation, clear boundaries, and mutual agreement.
For the consensual, real-world dynamics NTR relates to, see the JoinTheSwing answers on cuckolding, the cuckquean dynamic, and the hotwife lifestyle.