Arise, fair sun, and kill the envious moon,
Who is already sick and pale with grief
That thou her maid art far more fair than she.
Be not her maid, since she is envious;
Her vestal livery is but sick and green,
And none but fools do wear it. Romeo and Juliet (2.2), Romeo
In this passage Romeo uses an intricate conceit to express a simple desire: to take Juliet's virginity. Romeo begins by saying that the envious moon, i.e., Diana, goddess of the moon and patron of virgins, is jealous of her servant's (Juliet's) radiance. He then begs Juliet to be Diana’s maid no longer; for the virginal uniform (vestal livery) she wears as a follower of Diana is sickly green in color, and not to remove it (i.e., to remain a virgin) would be foolish. Note how similar this passage is to Orlando's in As You Like It (2.3.4). Read on...
On the Nature of Romeo's Love
"If Shakespeare had proposed to himself to illustrate and make manifest the various movements and qualities appertaining to and constituting the passion of love, would he have made it the first action of his lover to rise from the feet of one mistress, and, without a moment's pause, throw himself before another; forgetting
from that time forth that the first had ever existed, much less held him in thrall? Is this the character of love? No: -- but it is the character of youth, and therefore Shakespeare has made his youthful man exhibit it: for Romeo is not a lover, nor any other individual modification of the human character; he has, in fact, no individual and determinate character at all, but is a general specimen of man -- a pure abstraction of our human nature -- at that particular period of its being which occurs exactly between boyhood and maturity, and which we call, by way
of distinction, the period of Youth." (Peter George Patmore. Imitations of Celebrated Authors, 4th ed.)