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The One Penis Policy

SDC Dr Eli Sheff Polyamorists Nextdoor Polyamory Polygyny One Penis Policy OPP
SDC Dr Eli Sheff Polyamorists Nextdoor Polyamory Polygyny One Penis Policy OPP
When polygyny masquerades as polyamory

In theory, polyamory is a form of consensual non-monogamy (CNM) that allows people of any gender to have partners of any gender. In practice, it can be incredibly difficult for some heterosexual men to allow the women in their polycule — “their” women — to partner with other men. This phenomenon happens frequently enough that it has become cliché in mainstream poly communities and earned the title of the One Penis Policy (OPP).


Polygyny is a form of CNM in which a man is allowed multiple wives but no husbands, and the wives are not allowed any additional sexual partners — not even each other. This relational style is among the oldest in recorded history and appears in many cultures and religious texts around the world, such as the Torah/Old Testament. In the United States, polygyny is most common among Muslims and the Fundamentalist Church of the Latter Day Saints (a conservative sect distinct from mainstream Mormons). Although the vast majority of these families are actually quite loving and supportive of their members, media attention has focused on the families with egregious offenses like child-rape with much older men marrying young girls and isolated communities that prohibit women from working for pay or attaining education. The original One Penis Policy, religious polygyny generally prohibits women from sexual (and often even social) access to any man other than her husband.

Polyamory in Theory

Polyamory is a relationship style that — at least in theory — provides equality and freedom for everyone, regardless of gender, sexual orientation, or any other potentially stratifying factor. As long as they are consenting adults, then whatever rules or guidelines the group negotiates apply equally to everyone. Some polys make special rules between couples who have one partner as primary above all others, or polyfidelitous groups that prohibit sexual contact with others outside of the designated circle, and those rules are generally applied regardless of gender. Gender parity is key in polyamory and one of the primary distinguishing features that differentiates polyamory from more traditional or androcentric forms of consensual non-monogamy like polygyny.

Polyamory in Practice

For many people who imagine polyamory before they actually attempt it, the actual practice often turns out to be far different than what they dreamed it would be. Although people routinely expect jealousy from others, they rarely expect to be jealous themselves. When confronted with sharing a beloved with another partner, however, almost everyone experiences some degree of jealousy. It is a rare case, indeed when a poly relationship lasts for years without having to confront the pain and insecurity associated with jealousy. Whether it is due to mainstream male socialization that demands exclusive sexual access to “his” woman or a sexual double standard that celebrates slutty men and demonizes women who are slutty, it is all too common for a man in a poly relationship to have trouble sharing a woman he loves with another man. The OPP can be an explicit rule that clearly states “No other men!” or an implicit policy enforced through freaking out only when the female partner dates a man but absent when she is dating women or transfolks. Either way, the impact is to create an expanded form of polygyny rather than polyamory.


As an ethnographer, mental health professional, and educator, I feel it is important context for the reader to know that this exact scenario — man wants to institute one penis policy — evolved in my polyamorous attempt and ultimately led to the end of my relationship with my ex-husband. Because I experienced this myself, it most likely influences the way I view others’ relationships with a One Penis Policy in place.

Polyandry and the One Vagina Policy?

Ironically, in my study of polyamorous families with children, I found far more triads composed of a woman with two men, rather than a man with two women or including a transgender person. Even though it was more common, there was no cliché about two men with one woman, in sharp contrast to the many stereotypes associated with two women and one man. This is not to say that women in poly relationships never attempt to limit their male partners’ access to other women; obviously, that can happen. It is just far less common than the OPP. Much more often, men in a relationship with a poly woman are allowed to establish and nurture whatever other relationships they wish. Also, it can be more difficult for men to find women who want consensual non-monogamy than it is for women to find men who are at least willing to experiment with CNM. Either way, poly women do not appear to attempt to enforce the one vagina policy with the frequency that poly men try to implement the one penis policy.

If readers have experienced a polyamorous woman who wished to put the OVP in place, I would be very interested in hearing about it, so please leave a comment.

Dr. Elisabeth "Eli" Sheff

"Dr. Elisabeth “Eli” Sheff is a researcher, expert witness, coach, speaker, and educational consultant. With a PhD in Sociology and certification as a Sexuality Educator from the AASECT (the American Association of Sexuality Educators, Counselors, and Therapists), Dr. Sheff specializes in gender and sexual minority families, consensual non-monogamy, and kink/BDSM. Sheff is the foremost academic expert on polyamorous families with children and her 20+ year Polyamorous Family Study is the only longitudinal study of poly families with children to date. Sheff’s first book, The Polyamorists Next Door (2014 hardback and ebook, 2015 paperback and audiobook), details the findings of the first 15 years of her research on polyamorous families with children. Her second book, Stories from the Polycule (2015), is an edited anthology of writings by polyamorous folks. When Someone You Love is Polyamorous (2016) is Sheff’s shortest book that guides family members and significant others who are trying to understand a polyamorous loved one."
  • Anonymous
May 06, 2021
I’ve been in a foursome, which broke up because a) we discovered that the other man was abusing his wife (and had been before the foursome), wasn’t attracted to me (I’m totally bisexual, and he had said he was), and b) my wife became jealous. I don’t seem to feel jealousy easily, and didn’t then. Now I’m in an open relationship with my (next) wife, and since neither of us are particularly jealous people; it’s working just fine, and has for almost 10 years. Mostly, I see other men, and my wife is straight, so she does also. Usually I see men by myself, but we occasionally have mmf threesomes, and very occasionally my wife will see someone by herself. I haven’t yet had mf sex, alone, with another woman, only at parties (my wife can be in another room, with 1 or 2 guys, no prob for me, or her, as long as we’re both enjoying ourselves); my hetero needs are met pretty well by my wife, but there’s no prohibition there, just preference. In our opinions, monogamy is a rather absurd idea, except in some very rare cases… there’s always someone at the tail of a curve. But we are very concerned to keep our relationship primary.