Sometimes, you just wanna have some company and save water at the same time. But not all bathtubs are appropriate for two bodies. No one wants to sit on a drain or lean against an overflow so a drain near the center line of the tub eliminates this concern. Ideally, a tub for two would have a slanted back on both sides. Some couples love to have asymetrical slants so that each side offers a different type of reclining comfort.
What is the Perfect Bathtub Size

Measuring for Tub Size
When advising clients on tub sizing, a good place to start is to measure the length from hip to heel of the primary bather. Then, find a tub that is about that length along the bottom interior. For width, the interior bottom should be about 6-8″ wider than the primary bather’s widest part.