Seriously, I did not know that it could be annoying to a gentleman I'm with
when he is in the washroom if I have a look at one of my phones,
when he is occupied there.....
That's really rare that I did, and I am always excusing myself if I had to, if he came back earlier that expected...
It happens to some gentlemen too, to have to answer to urgent emails or phones sometimes.
We are all having a life outside of our activities of encountering, and things could happened.
I don't feel it is a so big problem. We are all adults and can understand that some situations could occurred.
If your session was not cut and you had all the attention of the girl/lady before and after your had visited the bathroom,
I don't understand your question then.
What did you expect?