Because, as per the plot of the series, majority of Mercenaries work solo and rarely as a group (even in this case mostly consisting of same gender).Its almost as if they cannot comprehend a guy being with a girl.
Aka, while there are significant number of female Mercenaries, they either tend to work solo (like Elma used to), or with other female Mercenaries as a group. And even if they work with male Mercenaries, its basically for a few jobs and not as a single group.
Mercenaries rarely hock-up with opposite gender as well, because they travel around the universe, so unless they work as a same group, chance of a male Mercenary being with a female is quite rare.
There is also the financial aspect as well, as most mercenary spend a lot of money without much saving, except when needed. So, most operate a single ship with a very low crew capacity, making working from a single ship as a group quite hard and rare.
So, in the end, to most Mercenaries, seeing a single male Mercenary working in a group with so many women is actually supposed to be quite rare, and apparently enviable.
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