In the past it was more common for men to work than women but this situation has changed and nowadays both sexes work. However, it would seem that there are still some differences between the sexes as some professions seem to attract more men than women and vice versa
It is quite common for men, rather than women, to be employed in jobs such as building construction. This is probably due to the effort and strength needed for such kind of labour and many not have sufficient physical power for this. However, there are many other careers in which far more men work than women such as engineering. Additionally, there are far more senior male managers and more to do with other factors such as education, expectation of family or social beliefs.
On the other hand there are other professions where mainly female employees can be found such as child care. This may be attributed to the fact that women are generally the child rearer at home and feel familiar and comfortable doing this type of work. Other jobs which have fewer males and nursing. It is believed that this could be due to the fact that women seen to be good communicators with the ability to empathize.
Taking everything into account, In my opinion I believe that it is not a question of suitability based on sex but suitability based on personality. Each person should do the type of job they personally feel most suited to, regardless of their sex.