This problem was solved for me when I shared a tin of pineapple with my bf in my bedsit. Pineapple sometimes gives me diarrhoea, and it did on this occasion. I had no choice but to rush to the bathroom - which was right next door to my bedsit - and go. It was very embarrassing but once it had happened I felt able to talk to my bf about pooping quite openly - thank goodness. He is the only person I have talked to about it until very recently.