There are three main aspects:

• keeping the promises you make
• avoiding making promises that you don’t think you will be able to keep
• renegotiating your promises rather than breaking them

All three are essential.First of all, if you break a promise you’ll be hurting someone, whether it’s just by inconveniencing them or more seriously by shaking their faith in your trustworthiness. Promises between partners are particularly important because they have chosen to rely on each other more than on other people. If your long-term partner, who you’ve chosen to spend your life with, turns out to be someone you can’t trust to keep their promises, you are going to be pretty upset.

But if anyone says that you should keep every promise, whatever it was and however long ago you made it, they are being very unrealistic. A promise is a prediction of the future. It expresses an intention that you will do something or not do something. None of us can accurately predict the future, though. Circumstances change, and even if you fully intended at the time to do whatever it was, it can become impossible.

Acting honourably involves keeping your promises as far as you can. But when a promise becomes difficult to keep, what can someone do then? They can break the promise and make the excuse that it would have been too difficult to keep it. Or, better, they can renegotiate the promise: say that they are finding it difficult to keep and suggesting an alternative.

But that isn’t all. Someone who promises the world but keeps renegotiating out of their commitments just annoys everyone they deal with, even if they don’t, strictly speaking, break their promises. This situation can be avoided by not makeing promises you don’t think you will be able to keep.

Promising monogamy

This might all seem obvious. But one very common promise is to be monogamous, and we all know how often that is made and broken. It is a promise implied (and sometimes explicitly stated) in the marriage vows, and it is also often implied when two people start to go out with each other and act as a couple.

I have always found it hard to understand how people can promise to love and have sex with only one person for the rest of their lives. Only around half of the people who make this promise go on to break it according to various surveys, so why promise it?

When I was quite young I decided that I was never going to get married, and I think it was because of this issue. Why make a promise I know I probably won’t be able to keep, and thereby risk my own happiness and that of the person I promise monogamy to? I seem to be unusual in this: most people who are lucky enough to find someone they love, who loves them and whom they are legally allowed to marry seem to manage to get married. Why not just swallow my qualms and do the same, Anna?

Well, I for one don’t want to ignore my reservations. I don’t believe I should make a promise I don’t mean to keep, and I don’t think I should try to kid myself that I can definitely be monogamous forever, however wonderful my partner is.

The reason that some people get married or otherwise promise to be monogamous, I suspect, is that it is conventionally required if you want to be with the person you love, get the rights that come with legal marriage and have your relationship sanctioned by society.

But those of us who want to commit to a long-term relationship don’t have to go along with this implied requirement. You can avoid legal marriage, either by not having any kind of ceremony by having a commitment ceremony. Or, if you want to get married and your marriage vows include the word faithfulness, you can make sure it is clear in the ceremony what you mean by this and whether it includes monogamy.

A promise of faithfulness could mean that:

• you will always take your loved ones’ interests into account in your decisions
• you will be honest with them
• you will put them first
• you will tell them whenever you have difficulty keeping any agreements you have with them
• you will renegotiate rather than breaking promises
• you will listen to them, communicate with them, be tolerant and accepting, and to try your best to act lovingly.

All these are things that you can make an effort to do. But promising not to fall in love with someone else, not to be attracted to anyone else, not to fall out of love, never to stop finding your partner sexually attractive – these are things you can’t control, so any such promise

For all those readers who find monogamy difficult: will you join me in refusing to promise it? To do so will be not an admission of weakness but a statement of integrity.

Yes – it’s called Open Fidelity.

I think it’s time for an overview of what I mean by Open Fidelity. The following statements sum it up.

• People can love more than one person at a time.
• There are people in honest, responsible relationships between three or more partners, and/or who have opened up their relationship to other lovers. It can be done.
• You don’t have to be monogamous to be faithful.
• Faithfulness means keeping your promises, whatever they were.
• Sometimes it is hard to keep your promises to your partner; it is better to renegotiate than break a promise.
• Being monogamous can be great if it works for you; better to choose it out of the range of responsible options than to assume it is the only ethical choice.
• Honesty is crucial in any relationship, especially if you have more than one partner or lover.
• Jealousy can often be overcome, or lived with, or used to add excitement to a relationship.

She has interviewed over a hundred people who have had no-strings-attached sex while married, without telling their spouses, and concludes that this is becoming more and more common in the UK. She also concludes that many of them don’t feel guilty about it. Women are no longer much less likely to have affairs than men, and age isn’t a barrier either.

Like so many journalists writing on this subject, Levin completely ignores the idea that someone might be honest about having sex with someone else. None of the interviewees seem to have considered for a moment the idea of telling their partners about their need for more sex, or about the fact that they are having sex with someone else. As usual, the choice seems to be between monogamy and cheating. The third article talks about what happens when the other spouse finds out, though this never seems to be through a confession.

Interestingly, there seems to be a consensus among the people interviewed that this extramarital sex keeps them sane and happy and therefore saves their marriage. To some extent I would agree with this: sex with others can enliven a relationship, as I have found myself and heard again and again from the people I’ve interviewed. But Levin does point out that “the partner who chooses to have a fling has to live a life of subterfuge and always be on the alert in case he or she is found out”. Yes, it is a big price to pay. I would go further: I’d say it the deceit that causes most of the problems, rather than the extramarital sex itself. In fact, if there is no deceit, sex with others has a much better chance of enlivening the relationship.

I want to say loud and clear to people in this situation: there is another way. You don’t have to be monogamous and you don’t have to cheat. But it requires talking to your spouse and telling them about your needs.

Here are some thoughts from an Open Fidelity perspective for someone who is married and considering having, or has had, a no-strings-attached affair, and who wants to stay in the marriage.

The ideal time to talk to your spouse about this issue is when you’re starting to feel unhappy and are tempted to cheat but before you have done anything concrete to find another sexual partner. It will be much more difficult to try and find a solution if you have already broken your original promises. But even that can be done. The longer you leave it, the more difficult it will be, either to keep the secret or to come clean. And the secret is almost bound to come out at some point.

Tell your spouse that you are having problems being monogamous. Tell them you have considered looking elsewhere for some sex, or that you have done so if that is the case. Also tell them how much you love them, how committed you feel and that you don’t want to leave them. Say that you would like to work out a way in which both of you can be sexually satisfied while still managing to stay together.

Then wait for the suggestion to sink in, for your spouse’s anger to die down, and for them to consider their options and the alternative options (the two of you splitting up; you having an affair behind their back; and you being unhappily monogamous). If your having sex with someone else with no strings attached will really not affect your love for your spouse or your relationship with them, it might be possible to convince them to accept this too (but make sure you are certain of it first!).

If you have been unhappy, the chances are they have also been unhappy, so they might be glad for the opportunity to talk about their difficulties. Who knows, they might also have been wanting something different in their sex life and have been wishing they could tell you. They might even have already guessed that you’re thinking of an affair. This will be an opportunity for you to work out what you both want and find a way in which your probably differing needs can be made compatible.

Then try, tentatively and gently, to negotiate with each other a solution that involves you getting some sexual fulfilment while staying with your spouse. I can’t say what the solution will be – each relationship is different – but I can, over the course of this blog, give you examples of people who have tried this solution and what they have learnt from the experience. Are there some rules that you can agree that will make it easier to cope with each other’s liaisons? Practising safe sex is an obvious example. Perhaps a period of strict monogamy would be a good idea while you find ways to make non-monogamy possible. Are you prepared for your spouse to have lovers too? If you find this idea difficult, ask yourself why. Look for support from others who have tried honest non-monogamy, perhaps via this blog and the links from it.

This whole blog is about this alternative to monogamy and cheating, called Open Fidelity, so keep reading if you want more tips.

She says: “Threesomes (whether purely sexual or otherwise) can work, but the setting up of any new situation must be very carefully negotiated between all parties to avoid conflicts, jealousies, resentments and the many other problems that can arise.” I’d agree with all this.

Nice to see that there are newspaper agony aunts who are open to the idea that good relationships don’t have to be monogamous. Although she does slip up in assuming that a man with a male partner is gay…