Social dancing in most cases, and in most places, involves dancing with a partner of the opposite sex. 
       It is normally the man’s privilege to ask a lady to dance with him. He should always ask politely, with a verbalized request such as “Shall we dance?” or “Would you like to dance?” 
       The lady should always accept willingly, unless there  is a very good reason for her not to. She may have observed his bad manners on the floor, or maybe he has had too much to drink, in which case she should turn him down politely with a “No, thank you.” If she refuses to dance with him because she needs to rest after a strenuous set, she must not change her mind and accept another partner until that particular dance is over. 
       If she does accept an offer to dance, and later finds her partner is not a very good dancer, she must put up with him until the dance is over, and cheerfully do her best to follow his leads. 
       The lady should never try to dance clutching a handbag behind her partner’s back, or worse swinging it from her hand. She should keep her hands free; even her handkerchief could be a hindrance to a firm hold for her moves. 
       No attempt should ever be made to teach the partner on the floor, without being asked to do so. Much less should a partner criticize the other’s dancing. Praise is a much more positive motivation for the partner. Many local dance instructors (DIs) are guilty of this, when they assume that guests do not know how to dance. 
       After each dance,  the man thanks the lady and escorts her back to her seat. She should also express her gratitude for the opportunity to dance with him. 

PECULIAR PHILIPPINE SITUATION
       Ballroom dancing in  the Philippines,  because of  its unusual popularity, has spawned practices  one would not normally find in other countries. 
       Peculiar, though not necessarily exclusive, to Philippine ballrooms are the so-called roving dance instructors or DIs who dance with guests in exchange for a form of remuneration called ‘tips’. 
       While the normal rules of etiquette are expected to be followed, adjustments  have been  made to suit the peculiar business situation. Who actually has the privilege of requesting the dance, the male DI or the female guest? 
       In practice, the male DI has the first choice, but  no one can actually stop a female guest from requesting a male DI to dance with her. She does have a right to choose the best dancing partner since she will be paying him for the service. 
       Either way, both partners should be respectful and polite to each other. 
       In the case of a male guest and a lady DI, the lady DI by circumstance requests for the  dance. There have been debates in some circles though that the male guest should still have the primary privilege to ask for the dance. In actual practice however, the male guest does not  even stand up to approach the lady DI for the dance. 

       Guests are expected to be respectful of other guests too. In situations where a guest wishes to dance with a particular DI, the guest waits until the DI has stopped dancing with another guest, before requesting the next dance. 
       Unless the guest has booked the DI for the night, he or she should allow the DI to dance with other guests. The guest may invite the DI to sit at their table for a drink or two but should not prevent him from dancing with the other guests. 
       If offered a drink, the DI may accept or decline, but if he accepts, should order one similar in price to the guest’s order. It is definitely impolite and insensitive to order a glass of cognac when the guest ordered a soda. 
       In all cases, respect is the key word.