The first and only scene Renly and Loras share together is when Renly's become a pretender to the Iron Throne, and has taken the field with House Tyrell supporting his cause - and even then they're not alone. Their relationship is then only really brought up again when Loras describes the events of that night to Jaime back in KL,
wa-aaay ahead in
A Storm of Swords.
Considering, I really can't imagine why so much was made of Renly and Loras being lovers, unless a lot more is going to be made of the characters, and sooner, than in the books. Or maybe it was just an excuse for some homo-erotic smut to break up the fighting & plotting - which never requires an excuse anyway. I mean, Daenerys ought to have a few equivalent scenes with Irri later, to balance things out.