I've noticed quite a few online reviews from men of M&S lingerie. These knickers are the latest I've seen. 3 reviews, 2 of which are by men.
I get the feeling that the review is part of the AGP fetish. It reminds me of flashing in that it's intended to make women/girls feel uncomfortable/shocked/embarrassed. I've seen men reviewing bras from the "Angel" first bra range too.