Munich also offers a fairly unique ticket type for multiple journeys.
You buy ten stripes and then use 2 stripes per person for a normal journey and then one stripe per pesron for a journey of 4 stops or fewer.
You need to validate each stripe on the little stamping machine on the U-Bahn, tram or bus.
The photo is of the stripe ticket I used with my wife when we were in Munich last week - you can use the stripes for multiple persons.