A fun ice breaker is to blindfold one male at a time and have him try to pick out his partner by feeling her breasts. Line up all the ladies and have him work his way down the line.
For more hardcore fun assign each female a piece of furniture and have the men pick choices from a hat. That is her partner and they have a place to do what they please. Lots of fun if you get creative. (floor, couch,kitchen counter, hosts bed)