By Julien Pretot CHERBOURG, France, July 3 (Reuters) - Although he is likely to celebrate taking the Tour de France yellow jersey on Sunday, world champion Peter Sagan said he does not enjoy himself on his bike as races have become a free-for-all. The Slovak switched his rainbow jersey for the yellow, but he was not all smiles especially as his Tinkoff team leader Alberto Contador crashed again and lost time after cracking in the finale of the second stage. "Riders ride like they don't care about life," Sagan told a news conference, hinting safety issues are not just to be blamed on in-race motorbikes. More...