I think most of the pairs can do without such disruptive hygiene measures.
If you know each other longer and familiarize each other, you can waive. How many couples have fallen on such a sex practice is hard to say, but certainly is not uncommon
Is the partner healthy and keeps clean, do not speak it without doing, no matter what Opening.
Why should you?
There is nothing if a proper shower is not clean
No, Something is done at most at Ons.