Have you noticed how many women have mood swings out of nowhere, even when they are not on their period?

[Steven8000]

They have more mood swings than men. Even when they are not on their period. Many women that I talked to about this, agree with me. Be happy in the beginning, than later on out of nowhere gets pissy, even though nothing happened moments before to get her pissed. So many women are bipolar-like. There are men like this too, but most of the time men don't tend to change their moods all of a sudden for no reason.

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+1 y

If a man changes his mood all of a sudden, most of the time something just happened but with so many women, their mood changes when though nothing happened to cause it and even though they are not on their period.

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+1 y

And no I'm not sexist. I am just saying it is something I noticed and many men and women that I talked to about this, actually agree. Not all of them but a lot of them agree.

[coldmarch]

I think you are right to some degree but the causes behind might not be "because bipolar". I'm very bad at reading women (I was educated and raised like if I was a male, by a strongly misogynous father), but what I noticed is that women do have a logic behind their mood swings, it's not random, just they're not going to tell you what is going on, what triggered them, so you'll stay without clues and most likely will make it worse. The problem at the root is the lack of ability to be transparent and honest, because not ready to face possible arguments or conflicts, and because educated to go through indirect, modest hints, fake courtesy and passive aggression, to communicate discomforts (then complaining men are "stupid" for not reading their minds). It's just a matter of how genders are educated to communicate to the world. Females are not educated to face conflicts, but to absorb, and to play all from "behind", as a "safer" style. Anything that could bring to a bad reaction, they will hide it and expect the others to "understand".
Said that, mood swings are really natural in introverts or anyway who has this kind of introverted attitude (in males too), because it brings the person to higher tension in general, or to be more vulnerable to triggers, or to detect and see things where there aren't, and to play indirect games to take small hidden revenges. They expect the others to work like them, mentally, and so will read things as much bigger than they are, and will expect others to understand what they think, and if they don't, then they take it like a deliberate offense or attack, lack of respect etc (without telling and without hinting about that, of course).
In a couple, if both genders are "traditional", then both of them have to smooth themselves: men should try to develop skills to understand what women want and what could trigger them and keeping in mind they're in constant mild tension and hypervigilant most of the time, and women should try to develop more communication skills to express what they feel without keeping too much inside, and learning to manage conflicts and the effects of disappointing others, without big struggle.
If you aren't keen to face this compromise, then you should go for an extroverted woman with a stronger personality than average and not much younger than you, to increase the chances to not run into this "incompatibility".

[PatriceONeal]

Search the internet and see how many women 18-29 are on some sort of anti depressant or mental health medication. MOTE. THAN. HALF.