I found it surprising too.
IMHO, i think it is more understandable if both choose to, or both choose not to.
i never understood why women wear one when their husband's don't. i've never heard of it the other way round. has anyone else?
whatever works for them i guess. i wouldn't be happy with it personally, but there's a lot of things lots of people do that i couldn't accept - so i don't. as long as tehy're happy that's all that matters, just with any couple getting married.