Im not a guy.. but from what I have read on here.. that of course the feeling of masturbation doesn't compare really to actual sex.
You have a certain grip, speed, rhythm.. that you masturbate and when having sex.. a vagina can't necessarily grip as tight as your hand... or can't just pound away at it as your hand would.

I have read where many guys cum fine when masturbating but last TOO long during sex b/c the sensation isn't as intense... so they just have to practice and get themselves accustomed to how sex feels as opposed to the hand.

> being a guy I masturbate a lot, but I'm wondering, is there anything that I can do to "train" myself for my next partner? I would struggle with ED and finishing too soon.

Please read the following article:
Squeeze & Training Exercise for Controling Premature Ejaculation

> Soo is there a way that I can masturbate that will prevent ED and premature ejaculation, and effectively train my body for my next sexual encounter.
Any thoughts?
--Joshua

ED can be either psychological or physiological in nature. A healthy young guy should not have a physiological problem; although, if you have health issues then you might suffer from this. If you have spontaneous erections and can masturbate OK, then if you fear a problem with a partner the cause is likely mental. The usual cause is angst and worry. The more you worry, the worse the condition. The cure: STOP WORRYING. It's true.

The link, above, will take care of PE. The reason guys suffer from PE is because we are turned on to a much greater degree when in the presence of a lover than when home alone. Also, we can control it because of our internal feedback. When we turn the reins over to someone else, we should provide verbal and/or non-verbal feedback on how we are responding to their touch.

[QUOTE=JOshua;187869] is there anything that I can do to "train" myself for my next partner?
[/QUOTE]
Don't masturbate. Suffer and dream about her.