I always did my best to not "let loose" before a game, just so I could save up as much energy and aggressiveness as possible. But, I had sex before a game once and I think it might've been the worst game I've ever played. I went 0-3 with 2 strikeouts and an infield fly, and I don't think I even came close to throwing anybody out on defense. But, like you...I just didn't give a fuck. :1orglaugh
I must say, I had the opposite effect than you guys. I always noticed that I felt like I was "on top of the world" and could do anything right after I wanked. I felt seriously pumped up. So I would wank at home, drive like a madman to the game and even after I suited up, I would still be on this "high". People sometimes thought I was "juiced" how intense I was at the start of games. It would wear out around the 3rd inning after which I would pretty much feel normal. I don't know if this routine helped, but it felt pretty cool doing it for awhile.