Relationship between dating and marriage
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Other couples drop out of the open marriage lifestyle and return to sexual monogamy.
The largest group, at 46.2 percent, said their partners experienced only a little jealousy.
The remaining 30.8 percent said their partners experienced moderate to extreme jealousy.
And meaning of "open marriage" can vary from study to study depending on how the particular researchers have set their selection criteria.
Individuals might claim to have open marriages when their spouses would not agree.