Question about the male's private part

My husband has always complained to me about not having a "long" enough penis. I tell him that he's crazy but anyways I want to find out if 'size (length) matters when TTC?? I tell him all the time it's not about the size or length of the penis, it's about how well the sperm swims and moves to the fallopian tubes. Please, help me out and tell me if I'm right or wrong! Thanks ladies :-)