Imagine, what are the odds that a couple could exist where both the woman and the man are seriously into long-distance cycling and they wear the same size shorts and they are so anatomically similar that they'd be equally comfortable borrowing eachothers bikes for multi-hour long distance rides?
Oh, my husband and I could wear each other's shorts. He's given me shorts before where he didn't like the chamois, and while he wouldn't borrow mine because I'd kill him, he bought his last pair based on a pair that I had. (He bought the men's version, but they were nearly identical.) The differences between men's and women's shorts are not that dramatic, I've found. If all of mine were dirty and he had a clean pair, I am pretty sure I could ride in them and never notice the difference.

But he's the one who told me about the used bike short ebay ads and the particular fetish for dirty bike shorts, so I think he'd think this was a troll, too!