As for higher levels for lifting, I suggest you experiment on your own. Remain a virgin if you want, but perhaps try ('scuse me for being crude) blowing a load prior to your workout. You may also try blowing one off right after the workout instead. The thought is, you might be able to lift more by ejaculating beforehand. But others say it's better to climax after working out and bath the muscle tissues in testosterone and other hormones when they are in recovery mode.
Honestly, I don't really do either of these, but my high school football and basketball coaches both preached this stuff. SO, try it if you want. It definitely does boost testosterone levels. Whether this method is what you want is a different question entirely.
It's pretty much meaningless whatever you do within 24 hours with respect to sex. To get a boost for the big game or whatever you should try to have an erection as much as possible without actually ejaculating starting... oh a week before the target competition. You could actually go ahead and masturbate/have sex the night before and it probably wouldn't hurt the effect although I'd recommend to wait till afterwards.
I've done this a number of times. When I played basketball my vertical seriously increased as much as 6 inches. I most recently did this in November of 2004 for a powerlifting competition. Before the comp, my deadlift had been stuck at 415 for at least 6 months. For the comp I deadlifted 465 and had more in me but no more attempts. Then I had sex (actually I MASTURBATED
) the next weekend I couldn't even deadlift 405. It didn't have anywhere near as much affect on my bench and squat, although it does have an affect on all the muscles to some extent.
But it doesn't transfer into any long term improvements at all. The same as protein stuffing and creatine. There's no long term improvements and so they are mostly a waste of time for the average person who does sports as a hobby.