When I was sixteen I rather clumsily tried on punk for size. Since I didn't actually know any punks my principal source of information was the local punk 'zine which I picked up at the record store. This was the heyday of veggie-punk, and tirades against vivisection were a common theme. Unfortunately, my sixteen year-old brain had vivisection and vasectomies slightly confused. While the subject of vasectomies made me squirm in my seat a bit, it struck me as a personal decision, and I couldn't quite understand why it elicited such vitriol from my would-be peers.
It's all much clearer now.