Working on a project with a boyfriend girlfriend couple?

I'm working on a sports med project with a guy and a girl who just HAPPEN to be in a relationship. They won't stop holding hands and talking and that's ALL FINE and everything but I need to get some input in. Whenever I ask a question one of them rolls their eyes and the other goes "research it" or "I dunno." and then they're back to snuggling and talking and giggling. How can I get what I have to say in without killing their buzz?