Champagne comparison to vodka

I’m going to a formal event and I’m being handcuffed to my date. Handcuffs are undone once you finish the champagne bottle you and your date share. I don’t know how big the bottles are but Ive never had champagne before. My limit with alcohol is 5 vodka shots and I’m out. Google says a glass of champagne is like 1/4 percentage compared to vodka. And the average champagne bottle pours six glasses??? Am I getting this right?