nope they can be same sex.
My girls have gotten very good at butt rub sex. Sometimes one leg is raised to hold onto the other.
My male Quaker would have sex with my green cheek in the same way. They were a very bonded pair before he was lost ..
Don't provide a nest.
Online DNA sex test is cheap and reliable. You print out their form, and barely nick a toenail to bleed. One or 2 drops to the paper. Send out when dry. Ir they can ship you a firm and pre printed paper. Hold flour on nail till stops bleeding. I prefer flour.
Or ask for vet DNA test.
Best to know what you got , a pair or same sex.