Actually, I was thinking that YOU are probably right.
Could be lots of reasons though.
I knew a guy that had a lot of itching and it was from yeast that both her and his girlfriend had. Plus she had one of those infections from the bad bacteria in the bowels being put into the vagina (what is that Trich?).
I knew another couple (friends) who were experiencing itchiness and it turned out that his 'inferior condom product' had some sort of anti-spermicide that he was allergic to.
Speaking of which, long ago my husband put a used condom, (tied up in a knot) on a nice piece of furniture (nightstand). Lazy $(*&@#! It ate thru the varnish by morning, from the anti-spermicide in it.