I'm wondering if it's possible that at this time, men were still allowed to take more than one wife. Could it be that this was a cultural issue that needed to be addressed, and was addressed to men simply because men having more than one wife was an issue, while women having more than one husband was not an issue?
I think that is one of the very reason Paul gave that requirement, polygamy was normal then, but the main reason is the need to know how to lead your own family before you can run God's family, hence the need to be married.
The rendering may be "one woman man", but since sexual relations were not allowed prior to marriage, there was no "dating" back then. The engagement was considered along the lines of already being married.
When I was single, I would find it quite hard to not want to be intimate with my girlfriends. I don't see how Paul was allowing a single man with a girlfriend to be an elder or deacon...it just doesn't make sense as it violates some of the other requirements.
"husband of one wife" is the correct rendering.