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The two spaces after a period date back to the days of typewriters. If you want to have two spaces after a period you'll have to put it in yourself by hitting the space bar twice, just like you would with a typewriter. It's not one of your formatting options.

You might be able to set auto correct to replace a ._(period space) with .__ (period space space) but it might have tricky repercussions (it might see the period space of period space space and replace it so you'd end up with period space space space)

Doing it yourself is safer.

No, even while human beings yawn i do no longer. i like to play a game with my friends the place somebody will yawn and we observed who yawns first. I in no way generally win till i'm ill with a chilly because of the fact i'm getting so drained it relatively is as though I stayed up an entire week with a wink of sleep.