In my experience....
Needs LOTS of space (don't take it personally)
Is brooding (this is often what he does in his alone time)
Hot and cold
Very passionate (like skip the foreplay and go straight to bangin')
Secretive...will not tell you how they really feel, in fact, they often say the opposite of how they really feel
Enjoys travel
Possessive
Jealous (even of your thoughts)
Enjoys emotional displays of others
Cautious until they are ready to give 100% in a relationship
Demands 100% control...will not do anything until he is ready
Will retreat when pushed
Loyal to one but is very flirtatious
Observant of surroundings
Is a work-horse...in an office, the men working late are usually scorpios
Enjoys the finer things (is usually into labels and how they look)
Excellent providers for those they love...very generous
Love children and are usually great fathers
Enjoys being with family and close friends (but is very discerning...doesn't let everyone get close)
Likes extremely feminine women
Manipulative to a large degree
Unforgiving...holds grudges when hurt
Seeks revenge when hurt (this is usually when the mind games start)
Hate being ignored (they lose control)
Painfully blunt and honest
Teases/pokes fun at those they like
Of course, some of these things are probably affected by other chart placements...
I have had relationships with several scorp's. I'm a cancer.
Will add more as I think of things