The two tests are essentially used to test curvilinear correlations but one is more accurate in non-parametric, the other for parametric distributions. It makes sense that the appropriate test is used for the data distribution ie gender data is most likely normally distributed. I checked my data distribution using SPSS and then took the appropriate statistical info. I think it wise to footnote the test used to add clarity and this is something I may need to add post viva (but I will wait and see!). Perhaps present some of the data to your supervisor to clarify before doing them all this way.
Just to add, in some of my data summary tables the data may show rho, t or R2 values depending on the data trend, but again this is detailed in my data handling section.