Yes, definitely talk it over with players beforehand. It's not really a matter of maturity here; sometimes (particularly if the players -are- the minority you're hitting) the reaction is "I deal with this #*@$( in real life; I want to do something different in a game," and you -don't- want to be surprised by this (or them to be surprised by it). Particularly since as described, it's a background detail, so it's not like it's going to be a surprise to their characters (unless they're travellers, I guess).
That said, it sounds like fun, and it sounds like you're going in the right direction; not messing with the mechanics, but applying situational bonuses based on adherence to gender role. This is the kind of thing that -could- work very well, producing a nice "alienation" feeling that helps the group form a sense of place that's different from the real world, and in general, I enjoy of addressing (rather than simply emulating) issues like this.