"That dress is simply stunning"
In the <b>sentence</b>, "It was stunning sex." 'stunning' is appropriate but the <b>sentence</b> itself is awkward. A better suited <b>sentence</b> with the same meaning would be, "The sex was stunning."
This is how you use the word "stun" in a sentence.
As a verb. e. g. I was stun by the amazing graphics of "Battlefield 3".
Her incomparable skill was stunning.
These fields of flowers are stunning.
That bejeweled cumberbund with his tuxedo is just stunning! That tuxedo complements his stunning good looks rather nicely.
The artist deftly arranged the colors on the canvas to create a stunning visual symmetry that captivated the audience.
the man built a stunning device for the future
My grandfather has many stunning items from 1970's.
I would use it correctly in a sentence, of course. Thank you for asking.
Jarry use paroxysm in a sentence.\
To me, the Canyon was a stunning place.