Hey Lori. I had a similar problem with my geckos not breeding. From a pure observation standpoint, it seemed to me my female always had the upper hand in dominance situations, so my natural assumption was that either she was hot, or he was cold, or both. They did start breeding this season though, and I have her first ever egg cooking right now, which was only laid a couple days ago on Sunday. Even after her eggs were deposited, I was skeptical about copulation having actually taken place, but last night I observed it twice and separated the two as to not cause excessive stress on the girl (Josephine). Can I ask how long you've had your geckos? Do you move them around or changed their setups frequently? I might attribute this to be a stress based cause. Another thing with Leos is that they all run on different cycles. Even though you had them go through brumation, some females will begin ovulating later than others. Josephine for example was a late starter this season, and I imagine she will continue to be in years to come. It's not uncommon for some geckos to only ovulate on an off season. If I were you I'd just observe your girls, and try to figure out each of their cycles. If he is somewhat of a cool male, I'd introduce females into his enclosure individually based on when they are clearly ovulating. After Josephine's first clutch, Cloud (my male) went sex crazy and wanted to copulate constantly. Taking away the stress and confusion (especially if he's a first timer, or cool) of many females at once may just do the trick. Besides that, I think the time apart will help as well. Anywho, long winded, sorry for that! Have a good one and I hope this helped a little.
Cheers,
-Matt