In order not to be disturbed in their adventure, Gino and Claudio give their shy friend Nino the task of keeping the two girlfriends at bay.

Despite this precaution, Lorella and Patrizia soon discover the devious undertaking to which their boyfriends are dedicated: stung by jealousy, they protest vigorously and contemplate revenge.

Ava and Mary also realize that their knights are doing a bad deed and having met Lorella and Patrizia by chance, they agree with them in order to punish the two Don Juan.

They first introduce Gino and Claudio to their father, a rude businessman who by dint of terrible handshakes reduces them as submissive as ever, while poisoning them with diabolical cocktails.

Gino chooses America and together with his friend goes to the Grand Hotel to ask for Ava's hand, but, instead of the American, he finds Sor Checco, father of Lorella and Patrizia who urges the two young people to keep their commitments .