Well, he was an alien.
But it does raise the question of how this species defines ‘male’ and ‘female’ if both can carry children anyway.
The females must also have motile eggs otherwise how was he impregnated? Genetic material must have passed from the female to the male.
The problem is the series always has some kind of humanoid alien, albeit occasionally with blue skin. Had he looked alien - as aliens almost certainly would - the issue of him being ‘male’ wouldn’t have come up.
But non-sexual reproduction is actually the norm in Doctor Who. Sontarans are all male and supposedly cloned although that’s obscured by the fact that a number of actors play them.
Cybermen and Daleks are produced on a production lines, the Cybermen using genetic material harvested from humans, the Dalek creatures again being clones.