[bryony]

I have been told that tucking was unlikely to be the cause.

That's surprising, as it is well known that undescended testes causes sterility if not testicular cancer. I suppose the questions are:
a) did you tuck into your body cavity
b) how long did you do it for? all day, or just a few hours

That leaves hormones and PM.

Ok... I note you didn't say "That leaves PM", so I'm guessing that you were on prescription hormones for a while before testing?

If so the combination of anti-androgens and estrogen is more likely to cause sterility, from what I've read.

Did you look at the paper with the rat testing? PM alone didn't affect their fertility at equivalent dosage levels.

B.