The Fundamentals of Sex

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Couples who have been together longer are more likely to have non-monogamous sexual agreements

Several factors may contribute to this correlation

Non-monogamy can be a feature of long-term relationships

People sometimes wonder if having a non-monogamous sexual agreement is bad for a relationship. There are lots of ways to respond to that concern, and not all indicators will come to the same conclusions. One very straightforward observation about relationship length and sexual agreements suggests we should be skeptical about the inherent dangers of non-monogamy.

Couples who have been together longer are more likely to have non-monogamous agreements.

This positive association between relationship quality and the likelihood of being in a non-monogamous sexual agreement was first noted in studies of sexual minority men more than 20 years ago (LaSala, 2004). In more recent studies, non-monogamous couples were together on average 8.75 years longer than those couples with monogamous sexual agreements........

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