Yeah of course. But as you're saying, it's just a little odd. History shows that focusing on one gender does eventually have bad consequences for the other gender.

ADepending on the science being done, genders are preferred. In many cases it's men due to less complex chemistry and internal anatomy. Men are more basic to start off with less risk of imbalance or damage if things go unexpectedly. Considering the nature of what's being done, this isn't at all odd for this trial. Sciences doesn't recognise gender bias unless it's studying gender bias.