Such a "monogamish" approach tends to be more common among gays, lesbians, bisexuals and transgendered people, notes sex therapist Margie Nichols.
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"I have seen a growing number (of) straight and same-sex couples thrive on the infamous 'monogamish' agreement, " psychotherapist Jean Malpas says.
That's not to say that monogamish couples are safe from infidelity, however.
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