But a new study had found that those in open relationships are just as happy, if not happier, than those in committed relationships.
Scientists say that despite the stigma, people in consensual open relationships report high levels of satisfaction and trust, as well as low levels of jealousy.
The sample included more than 2,100 people, with about 1,500 individuals in monogamous relationships and around 600 in committed non-monogamous relationships.
The group rated relationship components: satisfaction, commitment, trust, jealousy and passionate love, which is the intense love feeling often described in new relationships.
However, levels of jealousy were lower and trust was higher among those engaged in committed open relationships.