Relationship Forms, Sexual & Romantic Orientation

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People live and experience relationships in very different ways. Some are in a relationship with one person, others love several people at the same time. For some, sexuality is central, for others it plays a lesser role or no role at all. Romantic feelings can also be experienced in very different ways. Romantic and sexual orientations are independent of a person's sex or gender and can exist and be lived out in all possible combinations.

This diversity is normal and important. Terms for different relationship types and orientations help us to better understand ourselves and others, and they show that there is no single “right” way to experience relationships and sexuality.

An important note:


Sexual and romantic orientations are very diverse and can change over time. In our overview, we focus on the most common terms. A much more comprehensive overview can be found in the Queer-Lexikon.

Basic terms

Relationship models

Relationships can take many different forms. People have various needs, desires, and ideas about what closeness, commitment, and intimacy look like. The following terms describe some of the ways people can experience their relationships.

Relationship model


Monogamy

Definition


Exclusive partnership with one person, both sexually and emotionally. This can be long-term or short-term.

Relationship model


Polyamory

Definition


Having several consensual, often romantic or sexual, relationships at the same time. Sometimes the relationships have different levels of priority -- for example, one may be the primary partnership.

Relationship model


Singlehood

Definition


Living without a committed relationship, voluntarily or involuntarily, permanently or temporarily.

Relationship model


Situationship

Definition


A casual, rather non-committal relationship that falls somewhere between friends with benefits and a committed relationship.

Relationship model


Open Relationship

Definition


Committed partnership with one person, but with the possibility of additional (mostly sexual) contact with other people. The rules governing how these other contacts are structured can vary greatly and are negotiated within the partnership.

Relationship model


Relationship Anarchy

Definition


No fixed rules or hierarchies between relationships; each connection is structured individually.

Relationship model


Friends with Benefits

Definition


A friendship combined with sexual intimacy, without the potential obligations that can come with a couple relationship.

Relationship model


Casual Dating

Definition


Individuals, who are typically single, meet up to spend time together or engage in sexual intimacy without the potential obligations that can come with a romantic relationship or other types of relationships.

Based on these different relationship models, the meanings of infidelity and cheating can also vary greatly. Learn more in this video:

Non-monogamy

Non-monogamy


For a long time, monogamous relationships—that is, relationships with just one other person—were considered the norm, but alternative relationship styles, such as polyamory, are now becoming increasingly common. Bröning, S., Korinth, R., & Mazziotta, A. (2025). Was wissen wir über Polyamorie als Beziehungsmodell? Forschungsüberblick und Schlussfolgerungen für Beratungskontexte. Beratung Aktuell, 26(1), 15–33. doi.org

Time for Reflection

Think about your own preferences

What values do I want to uphold in my relationships?

How important is emotional and/or sexual exclusivity to me?

Can I imagine that it’s possible to feel love or affection for more than one person at the same time?

What beliefs about “proper” relationships have I accepted without really questioning them up until now?

Ethical Non-monogamy (ENM)

Relationships with multiple people

Why is monogamy no longer considered the only relationship model? Bröning, S., Korinth, R., & Mazziotta, A. (2025). Was wissen wir über Polyamorie als Beziehungsmodell? Forschungsüberblick und Schlussfolgerungen für Beratungskontexte. Beratung Aktuell, 26(1), 15–33. doi.org

For a long time, religious values and the lack of opportunities for separation and divorce, among other things, restricted people and imposed rigid rules. This also applied to life within relationships.

Church and state are increasingly separated, and our society as a whole is becoming more diverse.

Self-actualization is also an increasingly important topic and, in some cases, challenges traditional relationship models.

Alternative relationship models are now also more visible in the media where they are both depicted and discussed. Among other things, social media and the use of dating apps are also normalizing terms and concepts such as situationships

Ethically non-monogamous (ENM) relationships can contribute to living according to values outside of traditional gender roles, offering communication as equals and equal rights, or even enabling care within larger collectives.

At the same time, there are also potential risks Bröning, S., Korinth, R., & Mazziotta, A. (2025). Was wissen wir über Polyamorie als Beziehungsmodell? Forschungsüberblick und Schlussfolgerungen für Beratungskontexte. Beratung Aktuell, 26(1), 15–33. doi.org

  • Social stigmatization

  • Emotional damage within the relationship

  • Involuntary non-monogamy

  • Fragility of the relationship due to limited structural, financial, or time resources that are divided among more than just two people

Even though polyamory, with its principle that “love does not get smaller when you share it,” presents an image that is desirable for many, the implementation of alternative relationship models is also characterized by challenges.

But why do people engage in non-monogamous relationships? Studies show that the main reasons are as follows:

  • Personal growth and autonomy

  • Fulfillment of needs that are not met in a monogamous relationship

  • Expression of political values

  • Desire for sexual diversity

  • Need to belong to a community

  • Minority identity experience, such as sexual fluidity and bisexuality

Studies also show that about 4-5% of people have already been in a non-monogamous relationship and about 17% say they are, in principle, open to an alternative relationship model. 

The quality of relationships does not seem to differ significantly between monogamous and non-monogamous relationships. However, non-monogamous study participants reported higher sexual satisfaction, which could be due to the fact that sexuality and needs are inevitably discussed more in non-monogamous relationships, allowing expectations and needs to be communicated and negotiated more openly. Bröning, S., Korinth, R., & Mazziotta, A. (2025). Was wissen wir über Polyamorie als Beziehungsmodell? Forschungsüberblick und Schlussfolgerungen für Beratungskontexte. Beratung Aktuell, 26(1), 15–33. doi.org

Protection against STIs is especially important when you have multiple partners in non-monogamous relationships. Learn more in this video:

It is almost impossible to cover all types of relationships. The “Map of Non-Monogamy” provides a more detailed overview of different relationship models and gray areas:

 

Basic terms

Sexual orientation

Sexual orientation is defined by who a person is or isn't sexually attracted to. It is not about gender roles or specific sexual practices, but rather about attraction and desire. There are many different forms of sexual orientation, all of which are equally valid.

Sexual orientation


Heterosexuality

Definition


Sexual attraction to people of a different gender than their own

Sexual orientation


Bisexuality

Definition


Attraction to people of more than one gender

Sexual orientation


Pansexuality

Definition


Attraction to people regardless of their biological sex or gender identity

Sexual orientation


Homosexuality

Definition


Sexual attraction to people of the same gender as their own

Sexual orientation


Asexuality

Definition


Little to no sexual attraction to other people; does not automatically mean that relationships are not desired

For many non-heterosexual people, coming out can be a big step. Watch this video to find out what that means and learn more about it:

Basic terms

Romantic orientations

Romantic orientation describes who a person is emotionally or romantically attracted to. This orientation may or may not align with a person’s sexual orientation. Romantic attraction can also be experienced in many different ways, and all forms are valid.

Romantic orientation


Heteroromantic

Definition


Romantic feelings for people of the opposite gender

Romantic orientation


Panromantic

Definition


Romantic feelings regardless of the gender of the other person

Romantic orientation


Homoromantic

Definition


Romantic feelings for people of the same gender as their own

Romantic orientation


Aromantic

Definition


Little to no romantic attraction. Aromantic people can still experience friendships, sexuality, or other close bonds.

May, 2026

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