@justasking111, I was convinced the same when DD moved into her 2nd year shared house with the 3 boys and 2 girls she was in her halls flat with. This was the halls party flat....
They did a cooking and washing up rota and ate together all last year, and are planning to do the same this year
so it can happen, even in the most unlikely circumstances 
And it is so much cheaper, plus they eat nice meals as they only have to cook once a week.