“It’s Washington lore that at cocktail parties you develop these friends, everyone holds hands and sings ‘Kumbaya’ – but you’re first and foremost a partisan when you get to Capitol Hill,” UVA political scientist Jennifer L. Lawless said. She and a colleague evaluated bipartisanship on several measures, including how often men and women co-sponsor bills with members of the opposite party and whether men and women opted to travel on official congressional delegations with members of both parties, rather than stick to one-party travel. They found no differences between the sexes.