Fiona
Definitely include the 3rd woman into the conversation, engage her and make the playing ground seem equal among all three. Have both guys engage in a group dialogue of 5 then take turns talking to the girl of interest alone in between conversation while the other guy talks to the other two girls.

Christan
Entertain the 3rd women. This ALWAYS happens. The other women should definitely pay attention to their girlfriend, but if they don't the guys should do their best. If that doesn't work, the men should say, "I see you girls were enjoying yourselves, so why don't I give you my number and call me sometime when you have some free time. I hate to think I am taking you away from time with the girls."
She'll call, trust me.

Sam
Get the number, respect the friend, and suggest a time and place that you may be later and that she is more than welcome to attend or join up at a later time. Don't be pushy or disrespectful or not only will she leave but she will not even want to see/speak with you again.

Jenna
Include all three girls. Ask to buy that third girl a drink. Tell her a joke to make her laugh. Do something so that she won't feel like she stumbled into a double date, when all she thought was that she was going out for a night with her girlfriends. You can pay attention more to the girl that interests you, but try to engage all the people present in the conversation.

Lindsay
There is no way around it. Bring a third friend or recruit a wingman.

Jacqueline
BE NICE TO EVERYONE
TALK TO EVERYONE
IT'S A TURN ON WHEN A GUY CAN CLICK WITH YOUR GIRLFRIENDS SO DO IT.
EVERYONE IS HAPPY!

Lindsey
Make the third girl feel welcome, don't just single out the two girls that they're interested in. More often than not, a girl will date a guy that her friends approve of so why not put in the effort from the start by impressing the "third wheel" and making her a part of the conversation as well.

Molly
Try to include the third one. You can often score points with a girl by including her friends and showing them that you are a good guy.

Farhana
I think it is great when the guys offer to buy the whole group drinks. Then the extra girl won't feel out of place. It is also important for the guy include everyone there. Make it a group thing. I pay close attention to how guys treat my girls. I tend to not like a guy that isn't good to my girls. I want a guy to fit into my crew. My friends and my family is really important to me and will always be a part of my life.

Sekhinda
My advice : fella?s you should definitely try to approach girls with an even ratio of friends if opportunity a rises. In those uneven ratio situations my best suggestion is to try to talk to everyone in the group, mingle, hang out for a bit and not leave any one singled out. This will show the group of girls that you don?t just want to score two particular
numbers. Then if there is opportunity for you to talk to the girl in the group on a one on one basis surely the girls will definitely let you know. For example, the girl who doesn?t hit it off with any of the guys will most likely step aside. She will find something to do . . . .

Major Tip : But don?t push or rush the situation so much to push the girl who is left out to leave right away. From my personal experiences us girls (with good characters) will never leave one of our friends left out. The more haste and obvious you are about getting you and your buddy a date for the night with an uneven group of ladies, the more you will push the whole group of girls away. The girls might not even let you approach them! So watch for signals, be patient, and get to know the whole group is my main advice. In the end the two couples who hit it off, will find a way somehow to make the uncomfortable situation right accordingly.