How do I break it to him that he needs to get his sperm tested?
If you need him to get his sperm tested, the chances are you've been banging away for a few months without much result. It can be difficult to convey this to a guy. Two things I'd suggest:
Explain to him it will make the whole process a lot quicker potentially. You can identify any potential problems and that can save you sometimes a year or two. It gives you an understanding of where you stand.
I've been in the process -- several times. It can be a little daunting when you first go in there. But they provide you with plenty of good viewing material. The end of the day you just get to do what all blokes are very good at doing. A little tug and it's not that bad. So you can tell him he'll get to look at some great porn and he's really just got to masterbate.
He may be a little sensitive about the subject, but if you've been trying for a while you just want to make sure there are no problems and expedite the process. If there is a problem you can get onto it and you're not still trying in three years. Who knows what that will do to your relationship.
Hope that helps.
Sam and Tom,
Being Dad Team