Masturbating is pretty utilitarian. You're doing it to get something out of it. You want an orgasm, you do what you need to have one.
If you have sex with someone you don't know very well, it's not going to be the best. It'll be pretty darn disappointing. Chances are you won't orgasm from just sex with that person. You'll be incredibly self-conscious and worrying about what you look like, what he thinks of you and whether you're doing everything right or not. They don't know your body the way you do, and the only reason they really care about giving you any pleasure is so that you think they're good in bed. Not the best motivation. It ends up being awkward and unfulfilling and comes with a ton of baggage that nobody really needs.
That said, sex with someone you know well and who cares about you a lot is pretty phenomenal: better than masturbation by a long shot. Where masturbation is all about the finish line, sex is about the journey. It doesn't even matter if you never get to the end because you're having a great time along the way. The other person wants to make you feel good for your sake, not theirs. You can let loose and have fun, and laugh at the funny faces and noises that you make without feeling embarrassed. You don't have to worry about hiding that wobbly bit in your tummy because he knows about it and loves it just as much as any part of your body. You can't get that experience with a one night stand, or too early in a relationship.
Bottom line? Sex is overrated unless you're having it with the right person. Masturbation tops sex until you're with someone you care about and with whom you can really be yourself.
One note: if you're not ready to deal with everything that comes with sex, masturbation is always the best choice. It's a great way to hold off until you're 100% sure. [ NinjaNeer's advice column | Ask NinjaNeer A Question ]
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