As Vizzini said, go back to the beginning. ;-)
The pahtra entry in 1E's Alien Archive 2 says (on page 95): "Most pahtras are asexual, and a relatively small number of breeding couples bolster the population with litters of six to eight kits at a time."
My interpretation is that the majority of pahtra are asexual, but there are minorities of (genetically) male and female pahtra who are critical for the propagation of the species.
That doesn't address gender, but given Paizo's dedication to inclusiveness, it doesn't seem like a stretch at all to say that pahtra can identify anywhere on the spectrum of male, female, agender, genderfluid, etc., regardless of any potential reproductive role. It seems highly appropriate that their primary deity is a goddess of freedom!