Thanks Muppity - those are all great suggestions. DH could definitely work on the stress part, and he sits down all day, but he doesn't drink (much!), smoke or cycle and has just switched to boxers - though he's complaining that he keeps sitting on/squashing things and reckons he's doing more damage now than before when they were 'contained' !

We've made an appointment with an IVF nurse for next week just to get as much info as we can, so are hoping that will help us make a decision. We still really don't know what to do, though...