When they are hard and ready to cum they say all sorts to me ..
Can I see you regularly ?
Can we go out ?
do you do overnights ?
After the eruptions over & they scuttle off out I  don't hear from them again !

This is a pet hate of mine too, especially if they won't drop it like a dog with a bone.

They want us to go "Oh! I don't have one! I'm single!!!!!!!" I doubt it works often but it's like they are hoping they can catch you off guard type thing

I agree with this. I had one look extremely put out when I replied yes he does know, he gets off on it and wants to hear all the dirty details from me later. 

Speaking from personal experience of many many years.

It's just blokes that like the Hot wife or cuckold thing.

How it was told me was they get off being with a bad girl.

To each their own!

I don't take it as an attack, I take it more as they see me as an incredibly sexy, funny and charming woman and they are surprised that no one has hunted me down yet.

THAT is right and brilliant!
On my very astute days I reply, Why do you ask? and on other days I tell them, None of your business! Never been asked if I have a boyf/husband by anyone who has been a decent client. Naive curiosity from a client who has been fine will still get Noyb. Because it isn't.

It’s the same as “oh you pay tax? “ that one really grips my shit. No I just get cars and mortgages from the fairy god mother you twerp!

And a follow-up on "oh you pay tax?" - "Is it even legal?" 

One client recently asked me my status, & when I said I wasn’t married he kept pushing me to concede that I should before I got ‘old & past it’. Seriously. I’ve never asked a client before if he was married or about his personal life but I asked him, and he proudly declared ‘yes I am’, so I said ‘yes well then you are a great advert for it then are you?’ That shut him up.

Honestly, what bothers me about these questions/ interrogations is they don’t like the light being turned on them, so there is a touch of entitlement to it, like, their privacy should be respected but ours is up for grabs.