These people are extremely intense and deep when it comes to love! For them it is all or nothing in love. They either want to fully merge with you and possess your soul, or if you hurt them can hate you for life! Their dark side is that they can become obsessive, controlling or really jealous in live.
Superficial relationships are not their cup of tea and even if they do this, it will be just a temporary phase. They like to go deep down and dirty!;) Most of their relationships are very loyal and once they trust their partner they can explore amazing depths of intimacy and even experiment. A bit of domination, submission, tantra or more kinky,taboo sexual practices do miracles for their libido which is usually very high. If they do not have a constant sexual intimacy with their partner they can become highly unhappy and even depressed, but the paradox is that sex for them is not a physical act only but mostly deeply emotional and psychic one.
To really take their fancy, do not fully reveal your self quickly. They themselves are like icebergs in relationships-with much more underwater, hidden substance.
Something more to read...
The Most Passionate and Powerful Relationships of your Life