well never really IN the book. in the ending, like 30 years later they have 2 kids. so im guessing they slept together, unless there is some magical serum in panem that impregnates girls.
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well they slet together in the first book in the train and in the actuall Hunger Games in the cave
Not in the books, but technically they have to because in the epilogue of Mockingjay it says that they have two kids :)
The Rebels decide to rescue Peeta in Mockingjay because without Peeta they won't have Katniss's help. Katniss is severely depressed with him in the Capitol's hands and she can't think straight while Peeta is with them. That is the only reason why they rescued Peeta. Not because they care about him. They only cared about Katniss because she is the Mockingjay.
A kiss with peeta
At the end of Mockingjay, Katniss chooses Peeta.
Katniss is married to Peeta at the end of Mockingjay.
Peeta and Katniss.Catching Fire revolves around Katniss's fake pregnancy with Peeta's child and their marriage. There is small Katniss/Gale mentioned, such as Gale's quick kiss with Katniss, but the main pairing is Katniss/Peeta.