What's so exhausting about squid sex?

For dumpling squid like the ones pictured up top, sex is serious business. Mating sessions can last as long as three hours, and involve plenty of strenuous physical activity. Afterwards, the mating squid are left feeling so exhausted that their swimming endurance is halved, and it can take them up to 30 minutes to… » 7/24/12 11:40am 7/24/12 11:40am