We saw 1.1 - both doing the typical big cat thing and stretched out sound asleep! I can't tell you any more than that I'm afraid - one of our Czech colleagues may have more information.
Both are going really well together and there are regular pairings, but so far no offspring. I know the zoo planned to do an AI on them, but don´t know if they´ve proceeded with it yet. But it sounded like there is a little chance, even with AI, to have any cubs. I don´t know if there is a health problem with the male or female.
Prague has little luck with Asians. Even the previous girl-friend of Pentagon (Max is his house name here) Kalu from Burford was diagnosticed infertile and she was sent as an "exhibit-only animal" to France 2 years ago (Le Pal).