I was having a conversation with my roommates recently about being unable to poo at other ppls houses/in hotel rooms/cottages. They openly expressed having experienced this. It make me think that in a large way this is what I face for the most part. If there are ppl at my house, but I am comfortable around them, I will often get the urge to defecate. It is when I'm staying at someone else's, or in a hotel/etc that it is more likely to be a problem.
The other take away from the conversation with my roommates was the attitude and tone they had towards the topic- light-hearted and humorous. It reminded me to keep things in perspective, and make sure to laugh- this is the best way to open yourself up to the possibility of change.