Why shouldn't Juliet marry Paris in Romeo and Juliet?

In Shakespeare's timeless classic "Romeo and Juliet," the tradition of marrying for wealth and royalty is highlighted. Juliet is a young (13-year-old) girl who comes from a wealthy, royal line of Capulets. Paris is an older gentleman with ties to the Prince and wealth and royalty of his own. He asks Juliet's father for his daughter's hand in marriage, but Capulet encourages him to let her alone for  awhile, stating his fear that she may be ruined the way her mother was by marrying young, "And too soon marred are those so early made," (Act I, scene ii, line 13).

Juliet explains to her mother that she has no wish to marry yet, "It is an honor that I dream not of," (Act I, scene iv, line 66), when asked how she feels about getting married. However, that all changes once she meets Romeo. The love Romeo and Juliet feel for one another is fast and furious, and it clouds out any possibility of either of them marrying another.

As the play continues, Romeo is banished from Verona (ironically, on the day he is married to Juliet), which creates many problems for the young lovers. However, the worst problem it brings about for Juliet is that her father is now willing to give his only daughter to Paris, even though he recently told him he thought she is too young for marriage. "A Thursday let it be-- a Thursday, tell her/She shall be married to this noble earl," (Act III, scene v. lines 20-21). This news is woefully upsetting for Juliet, and drama ensues.

Her parents threaten to disown her if she does not comply with their wish for her to wed Paris, and even her faithful confidante and friend, Nurse, agrees that it's the best course of action, "I think it best you marry with the County" (Act II, scene v., line 219), effectively severing the ties of their relationship. Juliet wholeheartedly disagrees with the adults in her life, and finds a way out of the situation. Unfortunately, her "solution" ends in untimely death for the two teenagers.

All considered, it would be a bad idea for Juliet to marry Paris. She's in love with Romeo; she has given herself to him physically and emotionally. If she were to marry Paris (which she couldn't rightly do in the Catholic church anyway), she'd be expected to consummate the rite with him, which is a sickening proposition when you consider their ages. Furthermore, marrying Paris would only further her father's belief that he has the right to control his daughter and her choices, and if she were ever able to reunite with Romeo again, her marriage to Paris would certainly create a roadblock.