Is all of the feelings of love. It can also be seen as a form of sexuality where the emphasis isn't immediately regarding sexual intercourse but on all the feelings surrounding it, especially on building up the desire for sexual intercourse.
The word eroticism is derived from Eros, the god of love in Greek mythology.
Sigmund Freud was the one who first used the term for his idea of sublimated sexuality.
And according to Sigmund Freud, all and everything has to do with eroticism.
...Go on then, just a lil' quote by Sigmund;
"The only unnatural sexual behavior is none at all."