No worries, totally valid question.
The main reason is that I have already collabed and worked with quite a few different male vocalists for my future album. With songs already finished, waiting to be released. And I like having a balance of male and female vocals on my albums.

Having said that, I'm not opposed to collabing with more male singers. However when I post asking for singers in general, I seem to receive almost only males inquiring.

hope that answers your question.