Please, in one sentence only (per post), finish the sentence:
The difference between men and women is .
I’ll start.
The difference between men and women is that women put a napkin in the lunchbox.
OK, feeble, but it struck me this morning, since my wife happened to pack my lunch for me this morning, which in itself was unusual.
The difference between men and women is that women notice whenever someone in the office has had a haircut.
…that men buy the bottle of wine they’ve heard of, and women look for an interesting label.
…women usually tend to smell better, are softer and wetter, and are generally nicer to hold in your arms.
djm
Says you. 
The difference between men and women is that women will generally try negotiation before they resort to namecalling or fisticuffs.
The difference between men and women is “wo”.
The difference between men and women is that a lot of women recognize that the concept gender is a not a dichotomy, whereas it seems fewer men do.
In other words, I am not a woman, but I put a napkin in the lunchbox.
I’m fond of saying “Eww, women are gross!” especially when my best friends, both of whom are women, are around. (I like getting slapped.)
Hi
The difference between men and women is — if you really have to ask, you should get out more!
Regards,
Owen Morgan
Yacht Magic
Anchored in the lagoon, St Maarten
My new blog.
Click here for my latest reported position. (Use the satellite view.)
All my life, I have thought the difference(s) obvious… am I missing something here? 
Women like to chat, men always need to “get going.”
The difference between men and women is usually verifiable by a sufficiently close inspection. 
Hi
One of my favourite activities… Mutual close inspection… 
Regards,
Owen Morgan
Yacht Magic
Anchored in the lagoon, St Maarten
My new blog.
Click here for my latest reported position. (Use the satellite view.)
Well, women have XX chromosomes and men have XY.
So the difference would be XX-XY=A.
X² – XY = A is a hyperbola.
So the difference between men and women is a hyperbola.
Hope this helps.
Dude. You rock. 'Nuf sed.
Are we confusing the concept of “gender” with “gender identity”?
The first is a question of hardware, the latter, software.
(That said, I actually tend to agree with you, though I’m pretty sure we don’t share the same “identity”) 
Kudos to I.D.10-t! That was really good!
Interesting. It is also, largely, hyperbole.
Women are glorious, fantastic, wonderful, mysterious, and greatly attractive.
Men stink.