I have a tip for those difficult struggles.
When I was at university, sharing a house with 4 other people, I used to run the bath if I was seriously struggling to go to the toilet when everyone was in. I found that by turning the taps up enough it made a loud enough noise to drown out any sound I would make whilst goin to the loo.
You could even buy one of those waterproof shower/bathroom radio's and put that on too!!
Sometimes it would be difficult, cos someone would say, "you only had a shower this morning", but I just said I'd been working hard all day and just fancied a nice relaxing bath with lots of bubbles!! It did actually work!!
I hope this helps.