Of course, "gentlemen's agreement" is actually what it's called in French as well, and we don't go around thinking it's exclusive to French people because it uses English words (not that we don't do that with other terms…). It's just what it's called, and been called for hundreds of years.
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Edit: OK this is way off-topic but I can't help but snicker a bit when I see these kinds of comments. The idea that we even genderize words is very arbitrary in the first place, and very inconsistent between languages.
French for example has the word "écrivain" (author) which is very masculine-sounding and as such sounds weird when used for women; but the feminine "écrivaine" sounds atrocious to French speakers. Our canadian friends exported the word "auteure" (feminine of auteur; phonetically identical). It's a whole thing. Apparently we used to use "autrice" which actually rings pretty nice (similar to acteur / actrice == actor / actress).
You'd be hard pressed to see the debate in English around Author / Authoress.
These are potentially legitimately exclusionary though, because it's not completely absurd to think that grammatical rules can influence how friendly we perceive a profession to be to that sex; eg. "fireman" vs. "firefighter", or in french "Femme de ménage" [cleaning lady] vs. "aide ménagere" [cleaning helper].
Point is, there's no reason why most of these words can't be made gender-neutral in the first place. English speakers are lucky to have a mostly gender-neutral language at all. Did you know that in french, Banks, postboxes, cars and churches are feminine, whereas computers, telephones, ovens and monasteries are masculine?