Do couples often shower together?

I never showered with either of my previous girlfriends, but apparently, it's quite common. I know one co-worker shares a bedroom and shower with his girlfriend of 4 years to save on water/electricity. Another does the same thing.
For those of you who do, does it always turn sexual or is it only done every now and then? Is there also a practical reason for it?
Do couples often shower together?
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