Vitamin E helps for more cum? I’ve never heard that one. While I don’t doubt vitamin E plays a part in the healthy production of semen and sperm, I rather think water, amino acids and zinc have a more direct link.
I also wouldn’t recommend loading up on any fat soluble vitamin to excess as you can overdose and give yourself other problems. I don’t know about the toxicity plateau for vitamin E in specific, but I’m sure there is one. As long as you have reasonably balanced diet and have enough nuts, seeds and legumes (peanut butter counts) you’re probably okay. If you don’t tend to eat peanut butter, or sunflower seeds or whatever, the average multi-vitamin should be fine and give you plenty of vitamin E for semen production and everything else it’s responsible for in a healthy body. Walnuts are actually a superfood, in addition to vitamin E and selenium they also are a good source of omega 3’s. But we digress…
As far as the original poster’s concern, sometimes the glans is shaped in such a way that it is mostly closed even with a raging erection, which physically blocks ejaculate. Pinching back on the glans slightly pulls on the two skin folds and causes them to move apart, allowing the ejaculate to fly and be free. The makes sense if you think of it in terms of thrusting into a vagina, which would naturally provide some friction and likewise have the effect of pinching and pulling back (as the thrusting motion would tend to do) those same skin folds to clear the opening and allow delivery of the semen and sperm.
I don’t know as cumming in a big shooting spray on your partner is all that necessary, although I suppose it can be fun. I’d just caution you to consider that porn movies where that happens with regularity are one thing, actually having sex with someone you care about is another. Such displays are a standard feature of porn because it is essentially a visual medium and it is a convenient display of performance.
With someone you are involved with (or are getting involved with) these things tend to be less important. This is not to say they aren’t fun, or entirely beside the point, but just take in to account that the values are different when you are involved with a real live person rather than what you might see depicted on a screen.
Before: I'd like to show you something I'm very proud of, but you'll have to move real close.
After: I\'d like to show you something I\'m very proud of, but you guys in the front row will have to stand back.
God gave men both a penis and a brain, but unfortunately not enough blood supply to run both at the same time. - Robin Williams (: