As other posters have pointed out, who does what work is a very cultural thing.
In Iceland there are more women on road crews than in the UK- doesn't surprise me at all.
In West Africa, at least until very recently (may still be the case), nearly all the heavy farming work was done by women, while men dealt with the more "talking" roles of local government.
In the UK, most of the heavy nursing work, lifting and dealing with potentially violent patients, is done by women; in earlier times, people wealthy enough to pay anyone to do it at all would probably have employed a male servant and if we go back to the Middle Ages hospital work was often done by men.