common sense tells us it would likely make you a bit less amped up. personal experience tells me it doesnt have any effect. i what does have an effect tho, is if you start to jack off, or get sucked, fuck, whatever... but dont finish. and then go workout. youll have tons of energy. works great. i always try it, but almost every time i end up getting into it and just saying "fuck it" and going till i bust.