My husband and I have been trying to conceive for 1+ years now. I have been tracking my fertile week and using opks. My husband can usually perform fine, but when I tell him it's my fertile week or that I'm ovulating it seems like he can't always perform. What is your advice for having increases sex when it's critical without  giving him a mental block. He tells me to tell him when "it's time."   Help- I try not to get frustrated with him, but it's hard!