Pete - part of a socially monogamous married couple who are close like best friends yet retaining individuality.
He feels fulfilled in all aspects of his life thus happy being completely monogamous.
She too appeared to be likewise yet he knew sexually she needed more.
Acceptance his penis is small & size matters to her.
Great communication = solutions (asymmetric open relationship), she could then embrace her sociosexuality & better endowed men with Pete being sexually monogamous