It's not funny that the lady has five people looking up her skirt at one time. It is not funny that the guy has to go "perform" in a little room of second-rate porn. It is not funny when a couple doubts their chances of having a child. It is not funny that people have sex every day for months and don't conceive.
Just like rape is not funny (although, I know that's a losing battle), infertility is not funny. The only time it can be treated as such is when it is also treated as heartbreaking, a la Forget Paris. Infertility just for laughs is cheap and demeaning.
Thought you ought to know.