cheating (relationship)
Cheating, in a sexual sense, is having sex with someone other than one's regular partner in a monogamous relationship. When this happens among married people, this is known as adultery. This can also apply to meeting another without the regular partner knowing.
For the act of using dishonest means to win a competition or similar, see cheating (competitive).
See also
The following tags are aliased to this tag: cheating (learn more).