Party animal or taxi driver? 10 beers ore one warm coke? Fun or deadly dullness?

I'm pretty sure you are familiar with the following situation:

You and your current partner are sitting in your medium-sized vehicle on the way to a folksy drinking party.
Your throat is dry as a desert and your desire to drink a cool, tasty, creamy glass of beer is overwhelming at the moment.
Your partner also seems to think of nothing else than to sip at an icy glass of mojito mixed with a double shot of rum, a lot of ice cubes and fresh mint leaves.

But then suddenly the air freezes in your middleclass passenger vehicle space when the unavoidable question of horror comes up:

Who is the one who can drink as much as possible this evening and who is the poor guy who only sucks on a warm mineral-lemon the whole evening, and finally got the pleasure to take his drunken, bawling partner home?

I'm sure no one really knows who drove the last time but both are sure that definitely he/she played the taxi driver at the last party and he/she is allowed to drink to sudden death today and so on...
Bäääm - the conflict is in full swing!

Don't lose your good mood and install this simple, but effective - relationship-rescuing app on your mobile device!

Just pull out your smart phone and both of you know, who is the poor guy and has to drive today. No more hours of discussion in the future!

In the Driving-history the last 14 rides are shown to observe who is next in line of driving - there is no way to change the status quietly and furtively if the partner is currently not near.

Of course it's also possible to offer a deal and interrupt the order:
Maybe you can exchange a wonderful, wet, drunken evening against a small, intense (erotic) massage to your partner and he drives you home!

Cheers!