Next turn

After leaving their wedding reception, a young honeymoon couple hailed a cab to take them to their hotel.
The driver wasn’t sure how to get there and said he’d ask for directions when they got nearer to their destination. Meanwhile the lovers started getting really passionate in the back seat.
Seeing a fork in the road, the driver said, “I take the next turn, right?”
“No way,” panted the groom, “Get your own girl. This one’s mine.”

It’s Simple Math

What these are used for?