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I don't see why that should be a problem in questions. After all, nearly everybody quotes (often far older) textbooks in their answers.

As Blacksmith says, there might be a copyright issue but I can't really see you been dragged through the courts for using it as a question for no gain.

Any female with a pulse? It's in the genes.

What an extremely large question!

I am certain that just as there are people who shun relationships as a form of self-presevation from harm there are many who justifiably see relationships as being cramping and have a natural wish to grow without the constraints of forever having to consider someone else.

In a way it is rather like going on holiday on your own. You don't have to keep asking for agreement or making mutual plans which can be a compromise.

Yes, I'd say it is probably at heart a very selfish view point but not selfish in the negative sense.

I have a friend who is now 42 and when asked (as she often is) "why didn't you get married?" simply replies "I forgot".

She is independent but not defiantly or anti-socially so. She is successful and satisfied. She has warm and enduring friendships but cannot really see what more an exclusive relationship could add to her life.

I should think though (to eventually answer your question) that the percentage who are single by choice is quite small because so many other factors need to present for it to work really well.

Personally, I have spent a year or so in the past without any relationship (still interacted with friends and family of course) and got totally fed up with it and decided to go out and let whatever happened happen.

That is really no different from going out and deciding to be celibate (for want of a better word) and letting that turn out how it turns out.

Either way it is your choice and that is too rewarding to be branded 'selfish'. I have never understood what is wrong with being selfish if it does not harm others.

Well I'll be googled. Try this: key in Lewis acis into Google. Press button B and bingo.

Lewis acid is an electron pair acceptor. A Lewis base is an electron pair donor. This definition is more general than those we have seen to this point; ...
facultyfp.salisbury.edu/dfrieck/htdocs/212/rev/acidbase/lewis.htm

There are 815,000 other entries. Needle in a haystack?

He said:
He had used 'had' but actually he had 'had' in inverted commas, if he'd have had 'had, had' had that have been been more grammatically correct?'

Four in a row for a bonus mark? Best of luck.