They made it to the forest, and walked an appropriate distance away from the campsite, all within an hour. Gustav was more than thankful towards the transportation trucks, because in any crude conditions, it wouldn't have been as easy to walk fifteen kilometers, just to get to a forest!
Technology was great, but in this case it had a tiny downside. They made it to the appropriate distance so quickly, that Gustav didn't have enough time to calm himself down. More specifically, he couldn't calm his boner down whatsoever!
Typically it wasn't easy to walk around attractive, and naked women without getting at least somewhat excited, but the odds went against him furthermore. Once they made it a kilometer away from the forest camp, for example, Arila had already started stripping!