Jack chuckles, leaning back again. "Ah well, yeah, that's the thing, of course. However much sense it makes, it's always hard to overcome social conditioning." He spreads his hands. "After all, look at me! All right, so with me it's the other way round, but honestly - I've lived a hundred and fifty years through the nineteenth to the twenty-first century and I still find it hard to accept the concept of monogomy. I mean, I'm trying - I'm trying really hard nowadays, because of what it means to Ianto - but I still slip up and forget. It's hard, whichever way round it goes!"