@mazzzz@jerermy Poecs are among the easiest genera to vent sex. Experience raising specimens within the genus would be the best start. Sometimes images can be misleading, but with clear vent pics as seen above you can easily decipher gender.
In short, females will have a large and clear gonoslit at the vent whereas males will have a dot. Immatures can be sexed with ease this way.
Experience is key though, new keepers might not recognize the differences as easily. Check out some pictures(epigastric furrow) of male and female specimens, eventually you guys should get the hang of it.
There are many threads on this topic that would be useful to both of you, with pictures and all...search function is your friend.