What happens in Ancient Greece stays in Ancient Greece.

Tired of caring for three children (yes, George, that includes you), in 2012, Julie recruited Clarissa to go on a time traveling "ladies only" vacation. 

While the women were gone, George and Neal successfully fended for themselves and the kids, subsisting on a diet of ramen noodles and old fritos they found in couch cushions. Though neither George nor Neal nor the children changed their clothes during the entire time Clarissa and Julie were gone (7 days or 4,000 years depending on how you view time travel), the capable fathers made a game of it. 

Adin won 1st prize in "Who's That Smell?", an amateur game that George and Neal made up (which they later sold to the CNN network in 3014 - since at that time CNN ceased being a news network and reformed as a pornography / sitcom network). 

Meanwhile, Clarissa and Julie traveled to Ancient Greece, because Clarissa loves Greek food. Ironically, she felt that the food there didn't compare with the Greek food of 2012. Go figure. 

Upon their return, Julie and Clarissa refused to tell George and Neal what happened during their stay (because, as we all know, what happens in Ancient Greece stays in Ancient Greece). Still, Julie and Clarissa must have had some trip, because now all depictions of the Greek Gods Hera and Aphrodite look exactly like them.