We're also "unexplained". But since we've been thru one cycle of IVF..my RE learned a lot more of our situation. My DH has a good count..but his guys are swimming all over the place..not in a straight line like they should be, so they're not able to find there way, hehe. Also, my eggs are not of the best quality, and not dividing all that good..which she believes could be a biological issue. But she did say to me if my dh's guys were better..we'd probably have a child by now. So our IF is leaning more toward my dh.
But our next IVF is coming up and we're doing ICSI w/assisted hatching. So I'm praying that this will work for us this time. We did do ICSI last time, but out of my 17 eggs only 4 matured, 2 made it to ET. So we have a new protocol for next cycle...hoping it will all be worth it in the end.
Good luck to you all!!