Should my twins bathe together?

My boys are so very close. They do everything together. They are 7 years old and still share a room. I allowed them to bathe together until the age of 5. At 5 years of age, they began to discover each others private parts. At this point, I decided, no more bathing together. They still ask on occasion if they can take a bath together, but I will not allow it. They used to sit in the bathtub with each other for an hour and play. I know they miss that time together, however, I found that allowing them to bathe together at an older age would not be healthy for them. This was my first step in promoting their individuality.