Anniemac, there is certainly basis in what you say. A lot of people are given this so called diagnosis frankly becasue they have not been adequately investigated.
Unexplained infertility is actually no diagnosis at all - all this means is that the docs have failed to find out what is wrong.
The most common tests that tend to be omitted are:-
Adequate x-rays of the uterus which may show abnormalities not otherwise seen at laparoscopy.
Hysteroscopy - telescope inspection of the inside of the uterus which may occasionally show abnormalities not seen otherwise
Repeated sperm counts over several weeks and months to make sure there is no subtle abnormality
Testing the sperm in special media such as swim up testsvelocity testing. However, when they are done, they often uncover a hidden cause for the suppposed unexplained problem
Thorough hormone tests to detect abnormalities of male hormone or early falls in progesterone
Scanning of the ovaries to see if follicles really are developing and there are no sign of polycystic ovaries.
JMo I would ensure that all the above tests have been carried out, if not ask as to why.
HTH