Specifically, lawmakers are considering whether to remove a clause regarding fidelity from the contracts.
The move's been put forward by senators and is now by the Italian Senate's Judiciary Committee.
Senator Laura Cantini, who supports the bill, said: "It's the legacy of an outdated and antiquated vision of marriage, family and the duties and rights between spouses."
But Myra Frost said on Facebook: "A marriage is also a commitment... to be faithful for better or worse. If one can't see himself/herself adhering to it, why bother?
Ken-Cathy Main added: "Government should not be involved with a religious vow in the first place!"
And John Sturm Fuchs said: "I hate the modern/progressive world so much.
"If fidelity in marriage is outdated and obsolete, someone please get me a time machine."
A 2015 poll found 45 per cent of Italians had cheated on their partners at some point.
The same survey revealed more than a third of Brits (36 per cent) had been unfaithful.
