If you want to play it safe, stick to "ladies".
If the situation is casual and they are your age or younger, or if they are older but you think they would appreciate the flirtation, you can try "girls", but do so at your own risk
the correct salutation for two men is Messrs
If you are addressing a married couple who are both doctors you can address them two ways. You can address them by either stating Drs. Jack and Jill Smith or Dr. Jack Smith and Dr. Jill Smith.
If their surname were to be Mooney - - the Misses Mooney
Mr. Rick Miles and Mr. Denny Neessen
Dear Mr. Smith and Mr. Jones or Dear Sirs as an example
The proper salutation to address two men in a letter is "Dear Mr. [Last Name] and Mr. [Last Name]," using their last names. If they have different titles, you should use their respective titles, such as "Dear Dr. [Last Name] and Mr. [Last Name]." If you are unsure of their titles, simply using "Dear [First Name] and [First Name]" is also acceptable for a more informal approach.
There are at least two correct ways to formally address two married doctors: 1. The Doctors Michael and Mary Smith (preferred); 2. Dr. Michael and Dr. Mary Smith (feminist).
Marúawe - if you are addressing one personMarúawebukwu - if you are addressing two personsMarúaweeka - if you are addressing a group
Using a colon in the salutation and a comma in closing.
There are at least two correct ways to formally address two married doctors: 1. The Doctors Michael and Mary Smith (preferred); 2. Dr. Michael and Dr. Mary Smith (feminist).
http://wiki.answers.com/Q/What_is_the_salutation_for_two_men_and_one_woman"
The Revds John and Mary Smith