The ones I posted the pic of, the one was mis-sexed, so I put them together and they locked twice... third time they battled and behaved like males combatting.
I pulled them and probed the supposed female to find out they were both males.
I pulled the male het (the one I REALLY wanted to breed with one of my females) and I was not able to get him to breed for me at all last year. He did breed this year, but it was a HUGE production for him.
Basically my negligience last year scared him off breeding.
But it is a similar risk taken when people battle males, they may scare one off of breeding.
Bruce