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Relationships

Mumsnet has not checked the qualifications of anyone posting here. If you need help urgently or expert advice, please see our domestic violence webguide and/or relationships webguide. Many Mumsnetters experiencing domestic abuse have found this thread helpful: Listen up, everybody

Husband suggested opening marriage and mentioned my sister, am I overreacting?

341 replies

Falalalalalala86 · 16/03/2026 18:38

Posting in relationships for more traffic as haven’t been able to stop thinking about this. It feels quite petty compared to some things on here but it’s been playing on my mind all day.

DH and I have been together 12 years, married 7. Two kids (9 and 6). Generally we get on well.

Last night after the kids went to bed he asked if we could talk. I assumed it was something normal (finances, holiday plans etc).

Instead he asked if I’d ever thought about “opening up the marriage”.

I genuinely thought he was joking at first but he was completely serious. He said lots of couples do it now and it can actually make relationships stronger.

I was really taken aback and said absolutely not. He then backtracked a bit and said he was “just curious” and we don’t have to do anything.

But it’s really unsettled me.

I asked where this had come from and he said it was just something he’d been reading about online.

Here’s the bit that’s bothering me though.

When I pushed a bit more he eventually admitted there’s a specific person he was thinking about.

And it’s someone I know.

It’s actually my younger sister.

Apparently she’d joked with him a few weeks ago about “modern relationships” when we were all having drinks and he says that’s what made him start thinking about it.

I feel completely weird about the whole thing now and honestly a bit sick.

He’s saying it was just a hypothetical conversation and I’m massively overreacting.

But I can’t get past the fact that he clearly has been thinking about my sister in that way.

AIBU to think this is completely inappropriate or am I turning something stupid into a huge issue?

OP posts:
JustSawJohnny · 16/03/2026 21:39

He'd already be out the door, for me.

Absolutely fucking NOT!

And that's before he even mentioned your SISTER!!

Who the fuck does the cheeky bastard think he is?!!

Get him gone!

Jellytotsapplepie · 16/03/2026 21:40

Falalalalalala86 · 16/03/2026 19:55

Just to add, my sister wouldn’t be interested in him anyway which is the main point. I don’t even think she particularly likes him that much, never mind fancy him.

I think you are fooling yourself to protect you which is understandable

I don’t think he would have asked to talk
in this way if it was a joke

JustSawJohnny · 16/03/2026 21:41

BellesAndGraces · 16/03/2026 18:40

AIBU to think this is completely inappropriate or am I turning something stupid into a huge issue?

Tbh I’m concerned you have to ask …

100% agree with this.

Does he gaslight you and put you down a lot, OP?

It's really not normal that you don't realise how huge this is or doubt your reaction.

Hankunamatata · 16/03/2026 21:45

Yuck your sister. Is he insane?

outerspacepotato · 16/03/2026 21:46

Your husband wants to fuck your sister.

There went your marriage. I really don't think there's any coming back from this.

CruCru · 16/03/2026 21:47

Coconutter24 · 16/03/2026 21:21

Apparently she’d joked with him a few weeks ago about “modern relationships” when we were all having drinks and he says that’s what made him start thinking about it.

Are you sure she’s not interested in him? In what way did she joke, like about modern relationships in general or joke about him and her? Sounds like she’s given him some sort of interest so I’d also be having words with her to find out exactly what was said

The thing is, I think this is a sort of victim blaming. Is the sister not allowed to make jokes within the family (even jokes that are not brilliant)? Is the sister somehow responsible for this man leaping to conclusions?

From the OP’s posts, I suspect that her husband is a middle aged man who thinks he is about 8 times as attractive as he actually is. And that the sister has better things to do than go anywhere near him.

Crikeyalmighty · 16/03/2026 21:51

Sorry, I would end the marriage with that

Coconutter24 · 16/03/2026 21:51

CruCru · 16/03/2026 21:47

The thing is, I think this is a sort of victim blaming. Is the sister not allowed to make jokes within the family (even jokes that are not brilliant)? Is the sister somehow responsible for this man leaping to conclusions?

From the OP’s posts, I suspect that her husband is a middle aged man who thinks he is about 8 times as attractive as he actually is. And that the sister has better things to do than go anywhere near him.

I’d be more interested to find out if my sister was actually making jokes or if she was giving him an invitation. It’s most definitely not victim blaming.

mjf981 · 16/03/2026 21:52

He's not in the wrong to have a conversation about an open marriage, but he should respect your wishes if you're not at all open to it.

But why on gods green earth would he tell you he wanted to shag your sister??! That would shock me. He's a complete fool. I'm sorry you're married to him OP! Not sure how I could get past that.

However, I'd also question your sisters' intentions. You say she would not be interested, but it sounds like she is the one who initiated the 'modern relationships' conversation with your husband..

Comtesse · 16/03/2026 21:52

“Just joking” is the worst excuse of all time. Very hard to find a way back from this - you are not over reacting, he is way out of line.

Womaninhouse17 · 16/03/2026 21:53

That's appalling. I couldn't get past that. I suppose it's fair enough for him to broach the subject if it's been playing on his mind, but mentioning your sister is just wrong.

ERthree · 16/03/2026 21:57

Do yourself a favour and go and collect all the paperwork and cash that you can then sling his disgusting arse out the door. Your marriage is over because you will always hear those words. He meant everything he said. He is a bastard of the highest order.

krustykittens · 16/03/2026 22:01

If my husband told me he wanted to open up our marriage, specifically to my sister, he would want to make absolutely sure he could run faster than me.

Mistybluebay · 16/03/2026 22:02

I'm sorry to say the first thing that came to my mind after reading this was what would I do if my DH asked me to open our marriage It was an easy decision. I would be showing him an open door.

Dinosweetpea · 16/03/2026 22:09

Wake up OP, your marriage is over.

Vigorouslysnuggled · 16/03/2026 22:16

File for divorce OP he’s disgusting

thinkyone · 16/03/2026 22:23

Does anyone else think these types of AIBU are from men wondering how their partner might react if they ask? Surely no man can be so dumb to mention the possibility of opening a marriage with her younger sister. My reaction would be great I was hoping you'd agree to an open marriage but I was thinking with your dad.

Imlyingandthatsthetruth · 16/03/2026 22:27

I don't much like swearing in these threads, but OP, there's really only one way to say this:

He may or may not be fucking your little sister but he's sure fucked your marriage.

CheekyPony · 16/03/2026 22:28

i have friends who swing, and my husband and I have been known to occasionally play, but specifically mentioning your sister is a bit weird

dollytea · 16/03/2026 22:28

Surely this is fake

MeTooOverHere · 16/03/2026 22:29

Catlady007007 · 16/03/2026 18:49

OP I'm really sorry you had to hear that from him. I cannot imagine the shock and hurt.
He's an absolute sleeze.
Its eary to say just leave but it depends on your circumstances. I'd start working towards it though......
ETA I find the idea of 'Mother's Day' rubbish but for him to say that on the day that is supposed to be celebrating the woman who gave birth to his kids. What a prick.

Edited

Its easy to say just leave but it depends on your circumstances. I'd start working towards it though......

THIS ^ right here. Start now.

PyongyangKipperbang · 16/03/2026 22:30

thinkyone · 16/03/2026 22:23

Does anyone else think these types of AIBU are from men wondering how their partner might react if they ask? Surely no man can be so dumb to mention the possibility of opening a marriage with her younger sister. My reaction would be great I was hoping you'd agree to an open marriage but I was thinking with your dad.

No.

Just a quick google (or even an MN search) will show you how delusional these men are! Thats why I loved the article above, because they assume that they are so desirable and get very VERY cross when they find out that actually "The Wife" that they took for granted is getting far more action than they are!

MyCrushWithEyeliner · 16/03/2026 22:30

What a repulsive man 🤢

FloofBunny · 16/03/2026 22:32

I would be so unsettled and upset, OP.

Your DH needs to realise what he has in you and the children. I would cold-shoulder him for a while, go out with your friends without him (looking fab) and tell him straight up how lucky he is to have you. Frequently.

Why do so many men devalue what they have? This type needs a gigantic kick up the arse. Am so mad for you! 😡

PyongyangKipperbang · 16/03/2026 22:34

FloofBunny · 16/03/2026 22:32

I would be so unsettled and upset, OP.

Your DH needs to realise what he has in you and the children. I would cold-shoulder him for a while, go out with your friends without him (looking fab) and tell him straight up how lucky he is to have you. Frequently.

Why do so many men devalue what they have? This type needs a gigantic kick up the arse. Am so mad for you! 😡

I disagree.

I think she needs to say "Ok babe" and help him set up his Tinder, whilst also setting up her own. And then sit back and watch the dates that fail to flood in for him and her phone blows up.

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