There's only one way it'll make a difference: you'll be more comfortable with sex and with your own body.
It's not like a scarlet "M" appears on your forehead; the only thing masturbation does is make you feel good. That said, I've found women who are comfortable masturbating (not even doing it a lot, just comfortable with it) are more assertive about what they want in bed, and know more about what makes them happy. This isn't to say if you don't want to masturbate, you should: just that if you do, you learn things about yourself, so to speak.
Can you tell the difference between men who masturbate and who don't?
i don't think so.
Easy enough, just look for the ones that are still breathing.
You'd be surprised. Porn watching, however, is definitely universal.
I think it is really sad that there is such a taboo regarding masturbation. Society in general is so fear based. Granted we are programmed into that. Be scared and buy insurance and be safe. Be scared and believe in these controlling ideals and give up your freedom.
Be good, kind and don't harm beyond that who cares what you choose to do?
Guys tend to assume that a girl who doesn't masturbate doesn't know how to have a good time. THIS IS NOT ALWAYS TRUE; I am someone who doesn't masturbate because it simply doesn't float my boat, but I have a very pleasurable intimate life with my boyfriend and am perfectly comfortable with my body. And no, I'm not religious, and I was not raised in a Puritan or religious family.
I have actually experienced a lot of disbelief and stereotyping when I do "admit" that I do not masturbate... many people say, "Oh, you just don't know how to do it right" or "Oh, you just haven't practiced enough"... it's insulting when people say such things to me. Just like anal sex, homosexual sex, etc aren't for some people, self-pleasure is not for some people, and the stigma attached to people who don't masturbate is unproductive because sexuality is a very personal thing and no one is exactly alike. It is entirely possible to be perfectly comfortable with your own body and to have a full and satisfying sex life without being someone who masturbates.
No, people will not be able to tell the difference without being told your preferences. It's not a defining characteristic... masturbation does not always equal being a better lover or having a more satisfying sex life.
I don't doubt you've encountered stereotyping as someone who doesn't masturbate, but I actually find it rather ironic, because I've encountered so many people who stereotype women FOR masturbating, especially other women. It's usually because they don't or are uncomfortable admitting it, and assume you're freaky for owning a vibrator, or you don't have a satisfying sex life with your boyfriend if you have to masturbate (when personally I find the better my sex life the more I feel like masturbating). Or guys who think you're a whore because you need to, or who get they're ego bruised when they find out. I think both sides of this are suffering from a lot of bad press, people spend so much time trying to figure out what it means if we do or don' and can't just accept that it can, but not necessarily is for everyone, be a healthy part of one's sexuality.
Have you ever read the description of a vibrator? They add things like "great stress reliever", and "powered by A/C cord for unending pleasure and/or relaxation". Masturbation feels nice, you shouldn't worry about what other people think you do in the sanctity of your own home. Relax, lie back, and think of Ryan Reynolds.
One thing I often find a tad amusing is that I masturbate much more than my boyfriend. We have a satisfying sex life, but for him masturbation is an occasional treat when the day seems right for it. While for me it's practically a part of my daily routine that keeps me from being over stressed and helps me sleep, along with meditation, exercise and brushing my teeth. I might have a slightly higher sex drive than him, but masturbation isn't so much about that for me, it's that bit of 'me time' that keeps me from pulling my hair out, he smokes for that, I masturbate.