I think Vic is right. This is not a science YET. I have a male couperi who seems to only breed during the night. He seems to show no interest when I intro him to the females. When I check him the morning after they are locked up. Other males start courting as soon as they are aware of the female.
With their fairly long ties I tend to keep them together for at least 24 hours a visit. They are only together while breeding.
My females usually eat during the breeding season but my males have little appetite during that time. Perhaps my guys are kept a little cooler than Vic's guys.
Gale