i've used enemas in lots of different places even in open plan sleeper trains/buses (no compartments). I wouldn't worry too much it could be lots of things, your husband may not notice...
You have salofalk enemas - the foam right? They're so much easier, faster and neater to administer! I find 5 mins even is enough time on my side. Since they're foam I don't worry about it slipping low afterwards - not like liquid ones. Though I do a kind of headstand (more like a shoulderstand) on the bed afterwards if noone is around. To anyone who happened to see this i'm sure it would just look like an exercise...